add-equals-transact-sql.md

title	+= (Add EQUALS) (Transact-SQL) | Microsoft Docs
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ms.date	03/16/2017
ms.prod	sql-non-specified
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ms.technology	database-engine
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f1_keywords	+= +=_TSQL
dev_langs	TSQL
helpviewer_keywords	+= (add equals) compound operators, +=
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+= (Add EQUALS) (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-all_md]

Adds 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, add 2 and sets @x to that new value (37).

Transact-SQL Syntax Conventions

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 data type 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 + (Add) (Transact-SQL).

See Also

Compound Operators (Transact-SQL)
Expressions (Transact-SQL)
Operators (Transact-SQL)
+= (String Concatenation) (Transact-SQL)