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SIGN function [Numeric]

Returns the sign of a number.

SIGN( numeric-expression )

numeric-expression    The number for which the sign is to be returned.

For negative numbers, the SIGN function returns -1.

For zero, the SIGN function returns 0.

For positive numbers, the SIGN function returns 1.

• SQL/2003    Vendor extension.

The following statement returns the value -1

SELECT SIGN( -550 );