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Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
SQL analytics endpoint in Microsoft Fabric
Warehouse in Microsoft Fabric
SQL database in Microsoft Fabric Preview
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)