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What is the meaning of “GROUP BY” clause in Mysql?

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What is the meaning of “GROUP BY” clause in Mysql?

(a) Group data by column values

(b) Group data by row values

(c) Group data by column and row values

(d) None of the mentioned

I have been asked this question in a job interview.

My query is from The group by & having Clause topic in section Select Statement of MySQL

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The correct answer is (a) Group data by column values

The explanation is: None.

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