---
title: "+= (Addition Assignment) (Transact-SQL)"
description: "+= (Addition Assignment) (Transact-SQL)"
author: rwestMSFT
ms.author: randolphwest
ms.date: "03/16/2017"
ms.service: sql
ms.subservice: t-sql
ms.topic: reference
ms.custom:
  - ignite-2024
f1_keywords:
  - "+="
  - "+=_TSQL"
helpviewer_keywords:
  - "+= (add equals)"
  - "compound operators, +="
  - "assignment operators, +="
  - "augmented operators, +="
dev_langs:
  - "TSQL"
monikerRange: ">=aps-pdw-2016 || =azuresqldb-current || =azure-sqldw-latest || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric"
---

# += (Addition Assignment) (Transact-SQL)
[!INCLUDE [sql-asdb-asdbmi-asa-pdw-fabricse-fabricdw-fabricsqldb](../../includes/applies-to-version/sql-asdb-asdbmi-asa-pdw-fabricse-fabricdw-fabricsqldb.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).  
  
 :::image type="icon" source="../../includes/media/topic-link-icon.svg" border="false"::: [Transact-SQL syntax conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md)  
  
## Syntax  
  
```syntaxsql  
expression += expression  
```  
  
## Arguments
 *expression*  
 Is any valid [expression](../../t-sql/language-elements/expressions-transact-sql.md) 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)](../../t-sql/data-types/data-type-precedence-transact-sql.md).  
  
## Remarks  
 For more information, see [+ (Addition) (Transact-SQL)](../../t-sql/language-elements/add-transact-sql.md).  
  
## See Also  
 [Compound Operators (Transact-SQL)](../../t-sql/language-elements/compound-operators-transact-sql.md)   
 [Expressions (Transact-SQL)](../../t-sql/language-elements/expressions-transact-sql.md)   
 [Operators (Transact-SQL)](../../t-sql/language-elements/operators-transact-sql.md)   
 [+= (String Concatenation Assignment) (Transact-SQL)](../../t-sql/language-elements/string-concatenation-equal-transact-sql.md)