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Which of the following is not an integrity constraint?

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Which of the following is not an integrity constraint?

(a) not null

(b) unique

(c) identical

(d) check

The question was asked at a job interview.

The above asked question is from Integrity Constraints in portion Intermediate and Advanced Sql of RDBMS

1 Answer

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Best answer
Correct choice is (c) identical

The best I can explain: Identical is not an allowed integrity constraint in SQL. Not null prevents null values and unique only allows unique values to be entered. Check checks for a given condition.

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