subtract-equals-transact-sql.md

title	-= (Subtract EQUALS) (Transact-SQL) | Microsoft Docs
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ms.date	03/06/2017
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f1_keywords	-= -=_TSQL
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-= (Subtract EQUALS) (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-all_md]

Subtracts two numbers and sets a value to the result of the operation. For example, if a variable @x equals 35, then @x -= 2 takes the original value of @x, subtracts 2 and sets @x to that new value (33).

Syntax

-- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse  
  
expression -= expression  

Arguments

expression
Is any valid expression of any one of the data types in the numeric category except the bit data type.

Result Types

Returns the data type of the argument with the higher precedence. For more information, see Data Type Precedence (Transact-SQL).

Remarks

For more information, see - (Subtract) (Transact-SQL).

See Also

Compound Operators (Transact-SQL)
Expressions (Transact-SQL)
Operators (Transact-SQL)