2026-03-12 20:23:15

2026-03-12 21:23:47 +01:00
parent eab4b36eca
commit 93039b8489
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--- a/idev/example_create_primary_foreign_key.sql
+++ b/idev/example_create_primary_foreign_key.sql
@@ -0,0 +1,61 @@
+-- +----------------------------------------------------------------------------+
+-- |                          Jeffrey M. Hunter                                 |
+-- |                      jhunter@idevelopment.info                             |
+-- |                         www.idevelopment.info                              |
+-- |----------------------------------------------------------------------------|
+-- |      Copyright (c) 1998-2012 Jeffrey M. Hunter. All rights reserved.       |
+-- |----------------------------------------------------------------------------|
+-- | DATABASE : Oracle                                                          |
+-- | FILE     : example_create_primary_foreign_key.sql                          |
+-- | CLASS    : Examples                                                        |
+-- | PURPOSE  : Example SQL script that creates a Primary / Foreign key         |
+-- |            relationship between the EMP and DEPT tables. It is advisable to|
+-- |            create a non-unique index on all foreign keys.                  |
+-- | NOTE     : As with any code, ensure to test this script in a development   |
+-- |            environment before attempting to run it in production.          |
+-- +----------------------------------------------------------------------------+
+
+-- +-----------------------------------------------------------------+
+-- | ADD PRIMARY KEY                                                 |
+-- +-----------------------------------------------------------------+
+
+ALTER TABLE dept
+ADD CONSTRAINT dept_pk PRIMARY KEY(dept_id)
+    USING INDEX
+    TABLESPACE indexes
+    STORAGE (
+      INITIAL     64K
+      NEXT        64K
+      MINEXTENTS  1
+      MAXEXTENTS  121
+      PCTINCREASE 0
+    )
+/
+
+
+-- +-----------------------------------------------------------------+
+-- | ADD FOREIGN KEY                                                 |
+-- +-----------------------------------------------------------------+
+
+ALTER TABLE emp
+ADD CONSTRAINT emp_fk1 FOREIGN KEY (dept_id)
+    REFERENCES dept(dept_id)
+/
+
+
+-- +-----------------------------------------------------------------+
+-- | ADD NON-UNIQUE INDEX FOR THE FOREIGN KEY                        |
+-- +-----------------------------------------------------------------+
+
+CREATE INDEX emp_fk_n1
+  ON emp(dept_id)
+  TABLESPACE indexes
+  STORAGE (
+    INITIAL      64K
+    NEXT         64K
+    MINEXTENTS   1
+    MAXEXTENTS   121
+    PCTINCREASE  0
+    FREELISTS    3
+  )
+/