Compound operators execute some operation and set an original value to the result of the operation. For example, if a variable @x equals 35, then @x += 2 takes the original value of @x, add 2 and sets @x to that new value (37).
Transact-SQL provides the following compound operators:
expression operator expression
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expression
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Is any valid expression of any one of the data types in the numeric category.
For more information, see the topics related to each operator.
Returns the data type of the argument with the higher precedence. For more information, see Data Type Precedence (Transact-SQL).
The following examples demonstrate compound operations.
DECLARE @x1 int = 27;
SET @x1 += 2 ;
SELECT @x1 AS Added_2;
DECLARE @x2 int = 27;
SET @x2 -= 2 ;
SELECT @x2 AS Subtracted_2;
DECLARE @x3 int = 27;
SET @x3 *= 2 ;
SELECT @x3 AS Multiplied_by_2;
DECLARE @x4 int = 27;
SET @x4 /= 2 ;
SELECT @x4 AS Divided_by_2;
DECLARE @x5 int = 27;
SET @x5 %= 2 ;
SELECT @x5 AS Modulo_of_27_divided_by_2;
DECLARE @x6 int = 9;
SET @x6 &= 13 ;
SELECT @x6 AS Bitwise_AND;
DECLARE @x7 int = 27;
SET @x7 ^= 2 ;
SELECT @x7 AS Bitwise_Exclusive_OR;
DECLARE @x8 int = 27;
SET @x8 |= 2 ;
SELECT @x8 AS Bitwise_OR;
Reference
Operators (Transact-SQL)
Bitwise Operators (Transact-SQL)
Help and Information
Getting SQL Server 2008 Assistance