Which of the following is not an integrity constraint?(a) not null(b) unique(c) identical(d) checkThe question was asked at a job interview.The above asked question is from Integrity Constraints in portion Intermediate and Advanced Sql of RDBMS

Which of the following is not an integrity constraint?(a) not null(b)

1.	Which of the following is not an integrity constraint?(a) not null(b) unique(c) identical(d) checkThe question was asked at a job interview.The above asked question is from Integrity Constraints in portion Intermediate and Advanced Sql of RDBMS
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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