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