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What is the significance of NULL value and why should we avoid permitting null values?

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What is the significance of NULL value and why should we avoid permitting null values?
posted Oct 23, 2015 by Vrije Mani Upadhyay

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1 Answer

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Best answer

Null means no entry has been made. It implies that the value is either unknown or undefined.

We should avoid permitting null values because

Column with NULL values can't have PRIMARY KEY constraints.
Certain calculations can be inaccurate if NULL columns are involved.

answer Oct 26, 2015 by Shivaranjini
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