>>-SIGN--(--expression--)--------------------------------------><
The schema is SYSFUN.
Returns an indicator of the sign of the argument. If the argument is less than zero, -1 is returned. If argument equals zero, 0 is returned. If argument is greater than zero, 1 is returned.
The argument can be of any built-in numeric data types. DECIMAL and REAL are converted to double-precision floating-point number for processing by the function.
The result of the function is:
The result can be null; if the argument is null, the result is the null value.