| Oracle® OLAP DML Reference 11g Release 2 (11.2) Part Number E17122-07  | 
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The SIGN function returns a value that indicates when a specified number is less than, equal to, or greater than 0 (zero).
INTEGER. SIGN returns -1 when n<0, 0 (zero) when n=0, or 1 when n>0.
SIGN (n)
A numeric expression.
OLADM1895Example 8-97 Determining if the Result of a Numeric Expression is Greater or Less Than Zero
The following example indicates that the function's argument (-15) is less than 0 (zero).
SHOW SIGN(-15) -1