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___________ defines rules regarding the values allowed in columns and is the standard mechanism for enforcing database integrity.

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___________ defines rules regarding the values allowed in columns and is the standard mechanism for enforcing database integrity.

(a) Column

(b) Constraint

(c) Index

(d) Trigger
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The correct answer is (b) Constraint

Explanation: SQL constraints are used to specify rules for the data in a table.If there is any violation between the constraint and the data action, the action is aborted by the constraint.
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