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Asked: 2026-06-03T15:30:50+00:00

Is there a difference between @var := 0; and @var = 0; ? With

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Is there a difference between @var := 0; and @var = 0; ?

With and without the colon? What does that do?

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  1. Editorial Team

    In the case of SET, they are synonymous:

    SET @var := 1234;
SET @var = 1234;

    But = acts as a conditional operator when used in a SELECT:

    SELECT @var := 1234; -- 1234
SELECT @var = 1234;  -- 1

    So it’s generally best to stick to := for assignment to avoid confusion.

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