---
description: "+= (Addition Assignment) (Transact-SQL)"
title: "+= (Addition Assignment) (Transact-SQL) | Microsoft Docs"
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---

# += (Addition Assignment) (Transact-SQL)
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  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).  
  
 ![Topic link icon](../../database-engine/configure-windows/media/topic-link.gif "Topic link icon") [Transact-SQL Syntax Conventions](../../t-sql/language-elements/transact-sql-syntax-conventions-transact-sql.md)  
  
## Syntax  
  
```syntaxsql  
expression += expression  
```  
  
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## 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)