Sign() returns 1, 0 or -1 depending on whether x is a positive number, 0, or a negative number.
Syntax:
Sign(x)
Return data type: numeric
Limitations:
If no numeric value is found, NULL is returned.
Examples and results:
- Sign( 66 ): returns 1
- Sign( 0 ): returns 0
- Sign( - 234 ): returns -1
