Showing posts with label What are constraints? Explain different types of constraints. Show all posts
Showing posts with label What are constraints? Explain different types of constraints. Show all posts
Friday, March 26, 2010
What are constraints? Explain different types of constraints
...Constraints enable the RDBMS enforce the integrity of the database automatically, without needing you to create triggers, rule or defaults. Types of constraints: NOT NULL, CHECK, UNIQUE, PRIMARY KEY, FOREIGN KEY.
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