Knowing the Sign of a Given Number in MySQL

Knowing the Sign of a Given Number in MySQL

For a given number, it may be necessary to know the sign of the number for computation purposes.

If it is positive, zero or negative, you may have respective case to work on. The signs are returned as 1, 0, -1 for positive number, zero and negative number respectively.

Case 1: Positive number

SELECT SIGN(234) AS SIGN;where 234 is the value. +-------+| SIGN  |+-------+|    1  |+-------+

Case 2: Number is zero

SELECT SIGN(0) AS SIGN;where 0 is the value. +-------+| SIGN  |+-------+|    0  |+-------+

Case 3: Negative number

SELECT SIGN(-64500) AS SIGN;where -64500 is the value. +-------+| SIGN  |+-------+|   -1  |+-------+
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