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What is the role of “CONSTRAINS” in defining a table in Mysql?

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What is the role of “CONSTRAINS” in defining a table in Mysql?

(a) Declaring primary key

(b) Declaring Foreign Key

(c) Restrictions on columns

(d) All of the mentioned

The question was asked at a job interview.

The question is from Table Creation topic in portion Using SQL to Manage Data of MySQL

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Right option is (d) All of the mentioned

Easiest explanation: None.

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