SIGN(X) returns the sign of the argument as -1, 0, or 1, depending on whether X is negative, zero, or positive : SIGN « Math Numeric Functions « MySQL Tutorial

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MySQL Tutorial » Math Numeric Functions » SIGN   21. 32. 1. SIGN(X) returns the sign of the argument as -1, 0, or 1, depending on whether X is negative, zero, or positive mysql> mysql> SELECT SIGN(-32); +-----------+ | SIGN(-32) | +-----------+ |        -1 | +-----------+ 1 row in set (0.00 sec) mysql> mysql> SELECT SIGN(0); +---------+ | SIGN(0) | +---------+ |       0 | +---------+ 1 row in set (0.00 sec) mysql> mysql> SELECT SIGN(234); +-----------+ | SIGN(234) | +-----------+ |         1 | +-----------+ 1 row in set (0.00 sec) mysql> 21. 32. SIGN 21. 32. 1.  SIGN(X) returns the sign of the argument as -1, 0, or 1, depending on whether X is negative, zero, or positive 21. 32. 2.  Sign a list of data

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