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Editorial Team
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Asked: 2026-05-20T02:32:25+00:00

UPDATE CattleProds SET SheepTherapy=(ROUND((RAND()* 10000),0)) WHERE SheepTherapy IS NULL If I then do a

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UPDATE CattleProds
SET SheepTherapy=(ROUND((RAND()* 10000),0))
WHERE SheepTherapy IS NULL

If I then do a SELECT I see that my random number is identical in every row. Any ideas how to generate unique random numbers?

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1 Answer

  1. Editorial Team

    Instead of rand(), use newid(), which is recalculated for each row in the result. The usual way is to use the modulo of the checksum. Note that checksum(newid()) can produce -2,147,483,648 and cause integer overflow on abs(), so we need to use modulo on the checksum return value before converting it to absolute value.

    UPDATE CattleProds
SET    SheepTherapy = abs(checksum(NewId()) % 10000)
WHERE  SheepTherapy IS NULL

    This generates a random number between 0 and 9999.

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