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Which among the following are the correct definitions for “NULL” in Mysql?

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Which among the following are the correct definitions for “NULL” in Mysql?

(a) Absence of value

(b) Unknown

(c) Empty set

(d) All of the mentioned

This question was addressed to me in a job interview.

My enquiry is from Table Creation in portion Using SQL to Manage Data of MySQL

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Best answer
Right answer is (d) All of the mentioned

The best explanation: None.

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