SQL FunctionsNumeric FunctionsSIGNOn this pageSIGNReturns the sign of the argument as -1, 0, or 1, depending on whether x is negative, zero, or positive or NULL if the argument was NULL.SyntaxSIGN( <x> )ExamplesSELECT SIGN(0);┌─────────┐│ sign(0) │├─────────┤│ 0 │└─────────┘