add-equals-transact-sql.md

title	+= (Addition Assignment) (Transact-SQL) | Microsoft Docs
ms.custom
ms.date	03/16/2017
ms.prod	sql
ms.prod_service	database-engine, sql-database, sql-data-warehouse, pdw
ms.reviewer
ms.technology	t-sql
ms.topic	language-reference
f1_keywords	+= +=_TSQL
dev_langs	TSQL
helpviewer_keywords	+= (add equals) compound operators, += assignment operators, += augmented operators, +=
ms.assetid	9ea52519-80d1-473f-b988-0572f0e2c92f
author	douglaslMS
ms.author	douglasl
manager	craigg
monikerRange	>=aps-pdw-2016||=azuresqldb-current||=azure-sqldw-latest||>=sql-server-2016||=sqlallproducts-allversions||>=sql-server-linux-2017||=azuresqldb-mi-current

+= (Addition Assignment) (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

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 + (Addition) (Transact-SQL).

See Also

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