Question

___________ 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

Answer 1

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.