What is ‘Table constraint’? Give an example
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Explanation:
SQL constraints are used to specify rules for the data in a table. Constraints are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the table. If there is any violation between the constraint and the data action, the action is aborted.
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Explanation:
Uniquely identifies each row in a table. FOREIGN KEY - Uniquely identifies a row/record in another table. CHECK - Ensures that all values in a column satisfies a specific condition. DEFAULT - Sets a default value for a column when no value is specified.
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