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Snippet Name: Check Constraint - Create

Description: A check constraint allows you to specify a condition on a column in a table.

Also see:
» Unique Constraint
» Primary Key Constraint
» Foreign Key Constraints
» Current_timestamp
» Deferring Constraint Checking
» Add Primary Key Constraint example
» Constraint Checks
» Add constraint example

Comment: (none)

Language:
Highlight Mode: PLSQL
Last Modified: March 07th, 2009

ALTER TABLE
ADD CONSTRAINT <constraint_name>
CHECK (<column_name> != <value>);
 
ALTER TABLE
ADD CONSTRAINT cc_status
CHECK (status IN (1,2,3,4);
 
 
TO enforce formatting
 
ALTER TABLE person
ADD CONSTRAINT cc_p_ssn
CHECK (ssn LIKE '___-__-____');


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