SIGN(X)
Returns the sign of the argument as -1, 0, or 1, depending on whether X is negative, zero, or positive.
SELECT SIGN(-32); +-----------+ | SIGN(-32) | +-----------+ | -1 | +-----------+ SELECT SIGN(0); +---------+ | SIGN(0) | +---------+ | 0 | +---------+ SELECT SIGN(234); +-----------+ | SIGN(234) | +-----------+ | 1 | +-----------+
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https://mariadb.com/kb/en/sign/