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- (Negative) (Transact-SQL)

Returns the negative of the value of a numeric expression (a unary operator).

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

Topic link icon Transact-SQL Syntax Conventions

- numeric_expression

numeric_expression

Is any valid expression of any one of the data types of the numeric data type category, except the date and time category.

Returns the data type of numeric_expression, except that an unsigned tinyint expression is promoted to a signed smallint result.

A. Setting a variable to a negative value

The following example sets a variable to a negative value.

USE tempdb;
GO
DECLARE @MyNumber decimal(10,2);
SET @MyNumber = -123.45;
SELECT @MyNumber AS NegativeValue;
GO

Here is the result set.

NegativeValue
---------------------------------------
-123.45

(1 row(s) affected)

B. Changing a variable to a negative value

The following example changes a variable to a negative value.

USE tempdb;
GO
DECLARE @Num1 int;
SET @Num1 = 5;
SELECT @Num1 AS VariableValue, -@Num1 AS NegativeValue;
GO

Here is the result set.

VariableValue NegativeValue
------------- -------------
5             -5

(1 row(s) affected)

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