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Is there a difference between: "not variable is null" and "variable is not null"?

I am new to SQL and I am wondering if there is a difference between:

not variable is null

and

variable is not null
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1 answer

There is virtually no difference in both terms. Both relate to the nullability variable .

If there is any difference, then it is easy to read.

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Source: https://habr.com/ru/post/1667625/

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