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.
SET SheepTherapy = abs(checksum(NewId()) % 10000)
WHERE SheepTherapy IS NULL
This generates a random number between 0 and 9999.
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