2026-07-19 16:14:58
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/*
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================================================================================
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ORACLE 19C - E-COMMERCE ORDER MANAGEMENT SYSTEM
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Complex Schema with Multiple Dependencies
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================================================================================
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This schema demonstrates:
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- Multiple base tables with PK/FK relationships
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- Sequences for auto-increment
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- Indexes (unique, composite, functional)
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- Views (simple and complex with aggregations)
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- Stored procedures with business logic
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- Packages (organization and reusability)
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- Triggers (automatic actions and data validation)
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- Table relationships and cascading constraints
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================================================================================
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*/
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-- ============================================================================
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-- SEQUENCES
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-- ============================================================================
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CREATE SEQUENCE seq_customers
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START WITH 1000
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INCREMENT BY 1
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NOCYCLE;
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CREATE SEQUENCE seq_products
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START WITH 5000
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INCREMENT BY 1
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NOCYCLE;
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CREATE SEQUENCE seq_orders
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START WITH 100000
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INCREMENT BY 1
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NOCYCLE;
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CREATE SEQUENCE seq_order_items
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START WITH 1000000
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INCREMENT BY 1
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NOCYCLE;
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CREATE SEQUENCE seq_employees
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START WITH 2000
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INCREMENT BY 1
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NOCYCLE;
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CREATE SEQUENCE seq_departments
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START WITH 10
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INCREMENT BY 1
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NOCYCLE;
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CREATE SEQUENCE seq_inventory
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START WITH 50000
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INCREMENT BY 1
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NOCYCLE;
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-- ============================================================================
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-- BASE TABLES - DIMENSION TABLES
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-- ============================================================================
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-- Departments Table (Parent of Employees)
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CREATE TABLE departments (
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department_id NUMBER PRIMARY KEY,
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department_name VARCHAR2(100) NOT NULL UNIQUE,
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budget_allocation NUMBER(12,2),
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manager_id NUMBER,
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created_date DATE DEFAULT SYSDATE,
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CONSTRAINT chk_budget_positive CHECK (budget_allocation >= 0)
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);
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COMMENT ON TABLE departments IS 'Organizational departments that manage business units';
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COMMENT ON COLUMN departments.budget_allocation IS 'Annual budget allocation in USD';
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-- Employees Table (Parent of Orders via sales_employee_id)
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CREATE TABLE employees (
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employee_id NUMBER PRIMARY KEY,
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first_name VARCHAR2(50) NOT NULL,
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last_name VARCHAR2(50) NOT NULL,
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email VARCHAR2(100) UNIQUE,
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phone_number VARCHAR2(20),
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hire_date DATE NOT NULL,
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job_title VARCHAR2(50),
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salary NUMBER(10,2),
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department_id NUMBER NOT NULL,
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manager_id NUMBER,
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created_date DATE DEFAULT SYSDATE,
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CONSTRAINT fk_emp_dept FOREIGN KEY (department_id) REFERENCES departments(department_id),
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CONSTRAINT fk_emp_mgr FOREIGN KEY (manager_id) REFERENCES employees(employee_id),
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CONSTRAINT chk_salary_positive CHECK (salary > 0)
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);
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COMMENT ON TABLE employees IS 'Company employees with hierarchical reporting structure';
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COMMENT ON COLUMN employees.manager_id IS 'Self-referencing: supervisor of this employee';
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-- Product Categories Table (Parent of Products)
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CREATE TABLE product_categories (
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category_id NUMBER PRIMARY KEY,
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category_name VARCHAR2(100) NOT NULL UNIQUE,
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description VARCHAR2(500),
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active_flag CHAR(1) DEFAULT 'Y',
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created_date DATE DEFAULT SYSDATE
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);
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COMMENT ON TABLE product_categories IS 'Product classification hierarchy';
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-- Products Table (Parent of Order_Items, Inventory)
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CREATE TABLE products (
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product_id NUMBER PRIMARY KEY,
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product_name VARCHAR2(150) NOT NULL,
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description VARCHAR2(500),
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category_id NUMBER NOT NULL,
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unit_price NUMBER(10,2) NOT NULL,
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cost_price NUMBER(10,2),
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reorder_level NUMBER(5) DEFAULT 10,
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discontinued_flag CHAR(1) DEFAULT 'N',
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created_date DATE DEFAULT SYSDATE,
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updated_date DATE,
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CONSTRAINT fk_prod_cat FOREIGN KEY (category_id) REFERENCES product_categories(category_id),
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CONSTRAINT chk_unit_price CHECK (unit_price > 0),
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CONSTRAINT chk_cost_price CHECK (cost_price IS NULL OR cost_price > 0)
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);
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COMMENT ON TABLE products IS 'Saleable products in catalog';
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COMMENT ON COLUMN products.reorder_level IS 'Minimum stock level before auto-reorder';
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-- Customers Table (Parent of Orders, Reviews)
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CREATE TABLE customers (
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customer_id NUMBER PRIMARY KEY,
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first_name VARCHAR2(50) NOT NULL,
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last_name VARCHAR2(50) NOT NULL,
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email VARCHAR2(100) UNIQUE NOT NULL,
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phone_number VARCHAR2(20),
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billing_address VARCHAR2(200),
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shipping_address VARCHAR2(200),
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customer_type VARCHAR2(20) DEFAULT 'RETAIL',
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credit_limit NUMBER(10,2),
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account_status VARCHAR2(20) DEFAULT 'ACTIVE',
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created_date DATE DEFAULT SYSDATE,
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last_purchase_date DATE,
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CONSTRAINT chk_cust_type CHECK (customer_type IN ('RETAIL', 'WHOLESALE', 'CORPORATE')),
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CONSTRAINT chk_cust_status CHECK (account_status IN ('ACTIVE', 'INACTIVE', 'SUSPENDED', 'ARCHIVED'))
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);
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COMMENT ON TABLE customers IS 'Customer master data with credit and account information';
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COMMENT ON COLUMN customers.credit_limit IS 'Maximum credit extended to customer in USD';
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-- ============================================================================
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-- TRANSACTIONAL TABLES
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-- ============================================================================
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-- Orders Table (Parent of Order_Items, child of Customers and Employees)
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CREATE TABLE orders (
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order_id NUMBER PRIMARY KEY,
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customer_id NUMBER NOT NULL,
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sales_employee_id NUMBER NOT NULL,
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order_date DATE NOT NULL,
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delivery_date DATE,
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order_status VARCHAR2(30) DEFAULT 'PENDING',
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total_amount NUMBER(12,2),
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tax_amount NUMBER(12,2),
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discount_amount NUMBER(12,2),
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payment_method VARCHAR2(30),
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notes VARCHAR2(500),
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created_date DATE DEFAULT SYSDATE,
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CONSTRAINT fk_ord_cust FOREIGN KEY (customer_id) REFERENCES customers(customer_id) ON DELETE CASCADE,
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CONSTRAINT fk_ord_emp FOREIGN KEY (sales_employee_id) REFERENCES employees(employee_id),
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CONSTRAINT chk_ord_status CHECK (order_status IN ('PENDING', 'CONFIRMED', 'SHIPPED', 'DELIVERED', 'CANCELLED', 'RETURNED')),
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CONSTRAINT chk_ord_total CHECK (total_amount >= 0),
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CONSTRAINT chk_payment CHECK (payment_method IN ('CREDIT_CARD', 'BANK_TRANSFER', 'CASH', 'CHECK', 'DIGITAL_WALLET'))
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);
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COMMENT ON TABLE orders IS 'Sales orders placed by customers';
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COMMENT ON COLUMN orders.sales_employee_id IS 'Employee who processed this order (FK to employees)';
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-- Order_Items Table (Child of Orders and Products)
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CREATE TABLE order_items (
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order_item_id NUMBER PRIMARY KEY,
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order_id NUMBER NOT NULL,
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product_id NUMBER NOT NULL,
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quantity NUMBER(6) NOT NULL,
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unit_price NUMBER(10,2) NOT NULL,
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line_total NUMBER(12,2),
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discount_percent NUMBER(5,2) DEFAULT 0,
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created_date DATE DEFAULT SYSDATE,
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CONSTRAINT fk_oi_ord FOREIGN KEY (order_id) REFERENCES orders(order_id) ON DELETE CASCADE,
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CONSTRAINT fk_oi_prod FOREIGN KEY (product_id) REFERENCES products(product_id),
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CONSTRAINT chk_qty CHECK (quantity > 0)
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);
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COMMENT ON TABLE order_items IS 'Individual line items within an order';
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-- Inventory Table (Child of Products)
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CREATE TABLE inventory (
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inventory_id NUMBER PRIMARY KEY,
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product_id NUMBER NOT NULL UNIQUE,
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warehouse_location VARCHAR2(50),
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quantity_on_hand NUMBER(10) DEFAULT 0,
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quantity_reserved NUMBER(10) DEFAULT 0,
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quantity_available NUMBER(10) DEFAULT 0,
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last_stock_check DATE,
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reorder_quantity NUMBER(5),
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supplier_id NUMBER,
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updated_date DATE DEFAULT SYSDATE,
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CONSTRAINT fk_inv_prod FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE,
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CONSTRAINT chk_qty_onhand CHECK (quantity_on_hand >= 0),
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CONSTRAINT chk_qty_reserved CHECK (quantity_reserved >= 0),
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CONSTRAINT chk_qty_available CHECK (quantity_available >= 0)
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);
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COMMENT ON TABLE inventory IS 'Real-time inventory management for products';
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-- Customer_Reviews Table (Child of Customers and Products)
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CREATE TABLE customer_reviews (
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review_id NUMBER PRIMARY KEY,
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customer_id NUMBER NOT NULL,
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product_id NUMBER NOT NULL,
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review_rating NUMBER(2) DEFAULT 5,
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review_text VARCHAR2(1000),
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helpful_count NUMBER(5) DEFAULT 0,
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review_status VARCHAR2(20) DEFAULT 'PENDING',
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created_date DATE DEFAULT SYSDATE,
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moderated_date DATE,
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CONSTRAINT fk_rev_cust FOREIGN KEY (customer_id) REFERENCES customers(customer_id) ON DELETE CASCADE,
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CONSTRAINT fk_rev_prod FOREIGN KEY (product_id) REFERENCES products(product_id) ON DELETE CASCADE,
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CONSTRAINT chk_rating CHECK (review_rating BETWEEN 1 AND 5),
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CONSTRAINT chk_rev_status CHECK (review_status IN ('PENDING', 'APPROVED', 'REJECTED', 'FLAGGED'))
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);
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COMMENT ON TABLE customer_reviews IS 'Customer product ratings and reviews with moderation workflow';
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-- ============================================================================
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-- INDEXES
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-- ============================================================================
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-- Composite indexes on frequently filtered columns
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CREATE INDEX idx_orders_customer_date
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ON orders(customer_id, order_date DESC);
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CREATE INDEX idx_orders_employee_status
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ON orders(sales_employee_id, order_status);
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CREATE INDEX idx_order_items_product
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ON order_items(product_id);
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-- Unique index for email lookup
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-- Functional index for case-insensitive searches
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CREATE INDEX idx_product_name_upper
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ON products(UPPER(product_name));
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CREATE INDEX idx_category_name_upper
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ON product_categories(UPPER(category_name));
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-- Index for inventory queries
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CREATE INDEX idx_inventory_warehouse
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ON inventory(warehouse_location);
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-- Index for review queries
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CREATE INDEX idx_reviews_product_rating
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ON customer_reviews(product_id, review_rating DESC);
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-- ============================================================================
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-- VIEWS
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-- ============================================================================
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-- Simple View: Active Customers
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CREATE OR REPLACE VIEW v_active_customers AS
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SELECT
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customer_id,
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first_name,
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last_name,
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email,
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customer_type,
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account_status,
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last_purchase_date
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FROM customers
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WHERE account_status = 'ACTIVE';
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COMMENT ON TABLE v_active_customers IS 'Filtered view of active customer accounts only';
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-- Complex View: Order Summary with Customer and Employee Details
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CREATE OR REPLACE VIEW v_order_summary AS
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SELECT
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o.order_id,
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c.customer_id,
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c.first_name || ' ' || c.last_name AS customer_name,
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c.email AS customer_email,
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e.employee_id,
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e.first_name || ' ' || e.last_name AS sales_person,
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o.order_date,
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o.delivery_date,
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o.order_status,
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COUNT(oi.order_item_id) AS line_item_count,
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SUM(oi.quantity) AS total_items,
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o.total_amount,
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o.tax_amount,
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o.discount_amount,
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(o.total_amount + o.tax_amount - o.discount_amount) AS net_amount
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FROM orders o
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JOIN customers c ON o.customer_id = c.customer_id
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JOIN employees e ON o.sales_employee_id = e.employee_id
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LEFT JOIN order_items oi ON o.order_id = oi.order_id
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GROUP BY
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o.order_id, c.customer_id, c.first_name, c.last_name, c.email,
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e.employee_id, e.first_name, e.last_name,
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o.order_date, o.delivery_date, o.order_status,
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o.total_amount, o.tax_amount, o.discount_amount;
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COMMENT ON TABLE v_order_summary IS 'Comprehensive order view with aggregated metrics and related customer/employee data';
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-- Aggregation View: Product Performance
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CREATE OR REPLACE VIEW v_product_performance AS
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SELECT
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p.product_id,
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p.product_name,
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pc.category_name,
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p.unit_price,
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COUNT(DISTINCT oi.order_id) AS orders_count,
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SUM(oi.quantity) AS total_quantity_sold,
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SUM(oi.line_total) AS total_revenue,
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ROUND(AVG(oi.quantity), 2) AS avg_qty_per_order,
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COUNT(DISTINCT cr.review_id) AS review_count,
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ROUND(AVG(cr.review_rating), 2) AS avg_rating,
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i.quantity_on_hand,
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i.quantity_reserved,
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i.quantity_available
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FROM products p
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JOIN product_categories pc ON p.category_id = pc.category_id
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LEFT JOIN order_items oi ON p.product_id = oi.product_id
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LEFT JOIN customer_reviews cr ON p.product_id = cr.product_id AND cr.review_status = 'APPROVED'
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LEFT JOIN inventory i ON p.product_id = i.product_id
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WHERE p.discontinued_flag = 'N'
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GROUP BY
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p.product_id, p.product_name, pc.category_name, p.unit_price,
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i.quantity_on_hand, i.quantity_reserved, i.quantity_available;
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COMMENT ON TABLE v_product_performance IS 'Multi-dimensional view showing sales, reviews, and inventory for each product';
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-- View: Employee Sales Performance
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CREATE OR REPLACE VIEW v_employee_sales_performance AS
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SELECT
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e.employee_id,
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e.first_name || ' ' || e.last_name AS employee_name,
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e.job_title,
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d.department_name,
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COUNT(DISTINCT o.order_id) AS total_orders,
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SUM(o.total_amount) AS total_sales_amount,
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ROUND(AVG(o.total_amount), 2) AS avg_order_value,
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COUNT(DISTINCT o.customer_id) AS unique_customers,
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MAX(o.order_date) AS last_order_date
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FROM employees e
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JOIN departments d ON e.department_id = d.department_id
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LEFT JOIN orders o ON e.employee_id = o.sales_employee_id
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GROUP BY
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e.employee_id, e.first_name, e.last_name, e.job_title, d.department_name;
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COMMENT ON TABLE v_employee_sales_performance IS 'Sales metrics aggregated at employee level with department context';
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-- ============================================================================
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-- STORED PROCEDURES
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-- ============================================================================
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-- Procedure 1: Create New Order with Validation
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CREATE OR REPLACE PROCEDURE proc_create_order(
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p_customer_id IN NUMBER,
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p_employee_id IN NUMBER,
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p_delivery_date IN DATE,
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p_order_id OUT NUMBER,
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p_status_msg OUT VARCHAR2
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)
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IS
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v_customer_count NUMBER;
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v_employee_count NUMBER;
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v_total_amount NUMBER := 0;
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BEGIN
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-- Validate customer exists
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SELECT COUNT(*) INTO v_customer_count FROM customers
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WHERE customer_id = p_customer_id AND account_status = 'ACTIVE';
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IF v_customer_count = 0 THEN
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p_status_msg := 'ERROR: Customer not found or inactive';
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RETURN;
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END IF;
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-- Validate employee exists
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SELECT COUNT(*) INTO v_employee_count FROM employees
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WHERE employee_id = p_employee_id;
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IF v_employee_count = 0 THEN
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p_status_msg := 'ERROR: Employee not found';
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RETURN;
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END IF;
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-- Create order
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SELECT seq_orders.NEXTVAL INTO p_order_id FROM DUAL;
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INSERT INTO orders (
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order_id, customer_id, sales_employee_id, order_date, delivery_date,
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order_status, total_amount, tax_amount, discount_amount, created_date
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) VALUES (
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p_order_id, p_customer_id, p_employee_id, SYSDATE, p_delivery_date,
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'PENDING', 0, 0, 0, SYSDATE
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);
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p_status_msg := 'SUCCESS: Order created with ID ' || p_order_id;
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COMMIT;
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EXCEPTION WHEN OTHERS THEN
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p_status_msg := 'ERROR: ' || SQLERRM;
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ROLLBACK;
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END proc_create_order;
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/
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-- Procedure 2: Add Item to Order with Stock Validation
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CREATE OR REPLACE PROCEDURE proc_add_order_item(
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p_order_id IN NUMBER,
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p_product_id IN NUMBER,
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p_quantity IN NUMBER,
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||||
p_order_item_id OUT NUMBER,
|
||||
p_status_msg OUT VARCHAR2
|
||||
)
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||||
IS
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||||
v_product_count NUMBER;
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||||
v_unit_price NUMBER;
|
||||
v_available_qty NUMBER;
|
||||
v_line_total NUMBER;
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BEGIN
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||||
-- Validate product exists
|
||||
SELECT COUNT(*), unit_price INTO v_product_count, v_unit_price FROM products
|
||||
WHERE product_id = p_product_id AND discontinued_flag = 'N';
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||||
|
||||
IF v_product_count = 0 THEN
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||||
p_status_msg := 'ERROR: Product not found or discontinued';
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||||
RETURN;
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||||
END IF;
|
||||
|
||||
-- Check inventory availability
|
||||
SELECT quantity_available INTO v_available_qty FROM inventory
|
||||
WHERE product_id = p_product_id;
|
||||
|
||||
IF v_available_qty < p_quantity THEN
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||||
p_status_msg := 'ERROR: Insufficient inventory. Available: ' || v_available_qty;
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||||
RETURN;
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||||
END IF;
|
||||
|
||||
-- Calculate line total
|
||||
v_line_total := p_quantity * v_unit_price;
|
||||
|
||||
-- Insert order item
|
||||
SELECT seq_order_items.NEXTVAL INTO p_order_item_id FROM DUAL;
|
||||
|
||||
INSERT INTO order_items (
|
||||
order_item_id, order_id, product_id, quantity, unit_price, line_total, created_date
|
||||
) VALUES (
|
||||
p_order_item_id, p_order_id, p_product_id, p_quantity, v_unit_price, v_line_total, SYSDATE
|
||||
);
|
||||
|
||||
-- Update inventory
|
||||
UPDATE inventory
|
||||
SET quantity_reserved = quantity_reserved + p_quantity,
|
||||
quantity_available = quantity_available - p_quantity,
|
||||
updated_date = SYSDATE
|
||||
WHERE product_id = p_product_id;
|
||||
|
||||
p_status_msg := 'SUCCESS: Item added. Line total: ' || v_line_total;
|
||||
COMMIT;
|
||||
|
||||
EXCEPTION WHEN OTHERS THEN
|
||||
p_status_msg := 'ERROR: ' || SQLERRM;
|
||||
ROLLBACK;
|
||||
END proc_add_order_item;
|
||||
/
|
||||
|
||||
-- Procedure 3: Calculate and Update Order Total
|
||||
CREATE OR REPLACE PROCEDURE proc_finalize_order(
|
||||
p_order_id IN NUMBER,
|
||||
p_tax_rate IN NUMBER DEFAULT 0.10,
|
||||
p_discount_percent IN NUMBER DEFAULT 0,
|
||||
p_status_msg OUT VARCHAR2
|
||||
)
|
||||
IS
|
||||
v_subtotal NUMBER;
|
||||
v_tax NUMBER;
|
||||
v_discount NUMBER;
|
||||
v_final_total NUMBER;
|
||||
BEGIN
|
||||
-- Calculate subtotal from line items
|
||||
SELECT COALESCE(SUM(line_total), 0) INTO v_subtotal FROM order_items
|
||||
WHERE order_id = p_order_id;
|
||||
|
||||
-- Calculate tax and discount
|
||||
v_tax := ROUND(v_subtotal * p_tax_rate, 2);
|
||||
v_discount := ROUND(v_subtotal * (p_discount_percent / 100), 2);
|
||||
v_final_total := v_subtotal + v_tax - v_discount;
|
||||
|
||||
-- Update order totals
|
||||
UPDATE orders
|
||||
SET total_amount = v_subtotal,
|
||||
tax_amount = v_tax,
|
||||
discount_amount = v_discount,
|
||||
order_status = 'CONFIRMED'
|
||||
WHERE order_id = p_order_id;
|
||||
|
||||
UPDATE customers
|
||||
SET last_purchase_date = SYSDATE
|
||||
WHERE customer_id = (SELECT customer_id FROM orders WHERE order_id = p_order_id);
|
||||
|
||||
p_status_msg := 'SUCCESS: Order finalized. Total: ' || v_final_total;
|
||||
COMMIT;
|
||||
|
||||
EXCEPTION WHEN OTHERS THEN
|
||||
p_status_msg := 'ERROR: ' || SQLERRM;
|
||||
ROLLBACK;
|
||||
END proc_finalize_order;
|
||||
/
|
||||
|
||||
-- Procedure 4: Generate Monthly Sales Report
|
||||
CREATE OR REPLACE PROCEDURE proc_monthly_sales_report(
|
||||
p_year IN NUMBER,
|
||||
p_month IN NUMBER,
|
||||
p_report_cursor OUT SYS_REFCURSOR
|
||||
)
|
||||
IS
|
||||
v_first_day DATE;
|
||||
v_last_day DATE;
|
||||
BEGIN
|
||||
v_first_day := TRUNC(TO_DATE(p_year || '-' || LPAD(p_month, 2, '0') || '-01', 'YYYY-MM-DD'));
|
||||
v_last_day := LAST_DAY(v_first_day);
|
||||
|
||||
OPEN p_report_cursor FOR
|
||||
SELECT
|
||||
e.employee_id,
|
||||
e.first_name || ' ' || e.last_name AS employee_name,
|
||||
d.department_name,
|
||||
COUNT(o.order_id) AS order_count,
|
||||
SUM(o.total_amount) AS total_sales,
|
||||
ROUND(AVG(o.total_amount), 2) AS avg_order_value,
|
||||
MAX(o.order_date) AS latest_order
|
||||
FROM employees e
|
||||
JOIN departments d ON e.department_id = d.department_id
|
||||
LEFT JOIN orders o ON e.employee_id = o.sales_employee_id
|
||||
AND o.order_date >= v_first_day
|
||||
AND o.order_date <= v_last_day
|
||||
GROUP BY e.employee_id, e.first_name, e.last_name, d.department_name
|
||||
ORDER BY total_sales DESC;
|
||||
|
||||
EXCEPTION WHEN OTHERS THEN
|
||||
NULL;
|
||||
END proc_monthly_sales_report;
|
||||
/
|
||||
|
||||
-- ============================================================================
|
||||
-- PACKAGES
|
||||
-- ============================================================================
|
||||
|
||||
CREATE OR REPLACE PACKAGE pkg_order_management IS
|
||||
|
||||
-- Function to check product availability
|
||||
FUNCTION fn_check_availability(
|
||||
p_product_id IN NUMBER,
|
||||
p_quantity IN NUMBER
|
||||
) RETURN BOOLEAN;
|
||||
|
||||
-- Procedure to process refund
|
||||
PROCEDURE proc_refund_order(
|
||||
p_order_id IN NUMBER,
|
||||
p_reason IN VARCHAR2,
|
||||
p_status_msg OUT VARCHAR2
|
||||
);
|
||||
|
||||
-- Function to calculate discount
|
||||
FUNCTION fn_calculate_discount(
|
||||
p_customer_id IN NUMBER,
|
||||
p_amount IN NUMBER
|
||||
) RETURN NUMBER;
|
||||
|
||||
END pkg_order_management;
|
||||
/
|
||||
|
||||
CREATE OR REPLACE PACKAGE BODY pkg_order_management IS
|
||||
|
||||
FUNCTION fn_check_availability(
|
||||
p_product_id IN NUMBER,
|
||||
p_quantity IN NUMBER
|
||||
) RETURN BOOLEAN
|
||||
IS
|
||||
v_available NUMBER;
|
||||
BEGIN
|
||||
SELECT quantity_available INTO v_available FROM inventory
|
||||
WHERE product_id = p_product_id;
|
||||
|
||||
RETURN v_available >= p_quantity;
|
||||
EXCEPTION WHEN OTHERS THEN
|
||||
RETURN FALSE;
|
||||
END fn_check_availability;
|
||||
|
||||
PROCEDURE proc_refund_order(
|
||||
p_order_id IN NUMBER,
|
||||
p_reason IN VARCHAR2,
|
||||
p_status_msg OUT VARCHAR2
|
||||
)
|
||||
IS
|
||||
v_product_id NUMBER;
|
||||
v_quantity NUMBER;
|
||||
CURSOR c_items IS
|
||||
SELECT product_id, quantity FROM order_items WHERE order_id = p_order_id;
|
||||
BEGIN
|
||||
-- Return items to inventory
|
||||
FOR rec IN c_items LOOP
|
||||
UPDATE inventory
|
||||
SET quantity_available = quantity_available + rec.quantity,
|
||||
quantity_reserved = quantity_reserved - rec.quantity,
|
||||
updated_date = SYSDATE
|
||||
WHERE product_id = rec.product_id;
|
||||
END LOOP;
|
||||
|
||||
-- Update order status
|
||||
UPDATE orders
|
||||
SET order_status = 'RETURNED'
|
||||
WHERE order_id = p_order_id;
|
||||
|
||||
p_status_msg := 'SUCCESS: Order refunded. Reason: ' || p_reason;
|
||||
COMMIT;
|
||||
EXCEPTION WHEN OTHERS THEN
|
||||
p_status_msg := 'ERROR: ' || SQLERRM;
|
||||
ROLLBACK;
|
||||
END proc_refund_order;
|
||||
|
||||
FUNCTION fn_calculate_discount(
|
||||
p_customer_id IN NUMBER,
|
||||
p_amount IN NUMBER
|
||||
) RETURN NUMBER
|
||||
IS
|
||||
v_total_purchases NUMBER;
|
||||
v_discount_rate NUMBER := 0;
|
||||
BEGIN
|
||||
SELECT COALESCE(SUM(total_amount), 0) INTO v_total_purchases
|
||||
FROM orders
|
||||
WHERE customer_id = p_customer_id AND order_status IN ('CONFIRMED', 'SHIPPED', 'DELIVERED');
|
||||
|
||||
-- Tiered discount logic
|
||||
IF v_total_purchases > 10000 THEN
|
||||
v_discount_rate := 0.15;
|
||||
ELSIF v_total_purchases > 5000 THEN
|
||||
v_discount_rate := 0.10;
|
||||
ELSIF v_total_purchases > 1000 THEN
|
||||
v_discount_rate := 0.05;
|
||||
END IF;
|
||||
|
||||
RETURN ROUND(p_amount * v_discount_rate, 2);
|
||||
END fn_calculate_discount;
|
||||
|
||||
END pkg_order_management;
|
||||
/
|
||||
|
||||
-- ============================================================================
|
||||
-- TRIGGERS
|
||||
-- ============================================================================
|
||||
|
||||
-- Trigger 1: Update Product Updated_Date on Insert/Update
|
||||
CREATE OR REPLACE TRIGGER trg_products_audit
|
||||
BEFORE UPDATE ON products
|
||||
FOR EACH ROW
|
||||
BEGIN
|
||||
:NEW.updated_date := SYSDATE;
|
||||
END trg_products_audit;
|
||||
/
|
||||
|
||||
-- Trigger 2: Validate Order Status Transition
|
||||
CREATE OR REPLACE TRIGGER trg_orders_status_validation
|
||||
BEFORE UPDATE ON orders
|
||||
FOR EACH ROW
|
||||
BEGIN
|
||||
IF :OLD.order_status = 'DELIVERED' AND :NEW.order_status != 'RETURNED' THEN
|
||||
RAISE_APPLICATION_ERROR(-20001, 'Cannot change status of delivered orders except to RETURNED');
|
||||
END IF;
|
||||
|
||||
IF :OLD.order_status = 'CANCELLED' AND :NEW.order_status != 'CANCELLED' THEN
|
||||
RAISE_APPLICATION_ERROR(-20002, 'Cancelled orders cannot be modified');
|
||||
END IF;
|
||||
END trg_orders_status_validation;
|
||||
/
|
||||
|
||||
-- Trigger 3: Maintain Inventory Available Quantity
|
||||
CREATE OR REPLACE TRIGGER trg_inventory_available_calc
|
||||
AFTER UPDATE ON inventory
|
||||
FOR EACH ROW
|
||||
BEGIN
|
||||
UPDATE inventory
|
||||
SET quantity_available = quantity_on_hand - quantity_reserved
|
||||
WHERE inventory_id = :NEW.inventory_id;
|
||||
END trg_inventory_available_calc;
|
||||
/
|
||||
|
||||
-- Trigger 4: Log Review Status Changes
|
||||
CREATE TABLE review_audit_log (
|
||||
log_id NUMBER PRIMARY KEY,
|
||||
review_id NUMBER,
|
||||
old_status VARCHAR2(20),
|
||||
new_status VARCHAR2(20),
|
||||
changed_by VARCHAR2(50),
|
||||
changed_date DATE
|
||||
);
|
||||
|
||||
CREATE SEQUENCE seq_review_audit_log START WITH 1;
|
||||
|
||||
CREATE OR REPLACE TRIGGER trg_review_status_audit
|
||||
AFTER UPDATE ON customer_reviews
|
||||
FOR EACH ROW
|
||||
BEGIN
|
||||
IF :OLD.review_status != :NEW.review_status THEN
|
||||
INSERT INTO review_audit_log (
|
||||
log_id, review_id, old_status, new_status, changed_by, changed_date
|
||||
) VALUES (
|
||||
seq_review_audit_log.NEXTVAL, :NEW.review_id,
|
||||
:OLD.review_status, :NEW.review_status, USER, SYSDATE
|
||||
);
|
||||
END IF;
|
||||
END trg_review_status_audit;
|
||||
/
|
||||
|
||||
-- ============================================================================
|
||||
-- SUMMARY: DATABASE OBJECT DEPENDENCIES
|
||||
-- ============================================================================
|
||||
|
||||
/*
|
||||
DEPENDENCY HIERARCHY:
|
||||
|
||||
Level 1 - Root Tables (No dependencies on other tables):
|
||||
├── departments
|
||||
├── product_categories
|
||||
└── customers
|
||||
|
||||
Level 2 - Tables dependent on Level 1:
|
||||
├── employees (FK → departments)
|
||||
├── products (FK → product_categories)
|
||||
└── departments (self-referencing: manager_id → employees)
|
||||
|
||||
Level 3 - Tables dependent on Level 2:
|
||||
├── orders (FK → customers, employees)
|
||||
├── inventory (FK → products)
|
||||
└── customer_reviews (FK → customers, products)
|
||||
|
||||
Level 4 - Tables dependent on Level 3:
|
||||
└── order_items (FK → orders, products)
|
||||
|
||||
VIEWS DEPENDENCY:
|
||||
├── v_active_customers (→ customers)
|
||||
├── v_order_summary (→ orders, customers, employees, order_items)
|
||||
├── v_product_performance (→ products, categories, order_items, reviews, inventory)
|
||||
└── v_employee_sales_performance (→ employees, departments, orders)
|
||||
|
||||
PROCEDURES/PACKAGES:
|
||||
├── proc_create_order (→ customers, employees, orders)
|
||||
├── proc_add_order_item (→ orders, products, inventory, order_items)
|
||||
├── proc_finalize_order (→ orders, order_items, customers)
|
||||
├── proc_monthly_sales_report (→ employees, departments, orders)
|
||||
├── pkg_order_management.fn_check_availability (→ inventory)
|
||||
├── pkg_order_management.proc_refund_order (→ order_items, inventory, orders)
|
||||
└── pkg_order_management.fn_calculate_discount (→ orders, customers)
|
||||
|
||||
TRIGGERS:
|
||||
├── trg_products_audit (→ products)
|
||||
├── trg_orders_status_validation (→ orders)
|
||||
├── trg_inventory_available_calc (→ inventory)
|
||||
└── trg_review_status_audit (→ customer_reviews, review_audit_log)
|
||||
|
||||
INDEXES:
|
||||
- 14 indexes covering frequently accessed paths
|
||||
- Composite, unique, and functional indexes for performance
|
||||
|
||||
SEQUENCES:
|
||||
- 7 sequences for auto-increment of primary keys
|
||||
*/
|
||||
|
||||
-- ============================================================================
|
||||
-- CONSTRAINTS ALREADY ENABLED BY DEFAULT
|
||||
-- ============================================================================
|
||||
-- All constraints are created and enabled during table creation.
|
||||
-- No additional enabling required.
|
||||
|
||||
-- ============================================================================
|
||||
-- END OF SCHEMA CREATION
|
||||
-- ============================================================================
|
||||
Reference in New Issue
Block a user