+ (Add) (Transact-SQL)

 

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse yesParallel Data Warehouse

Adds two numbers. This addition arithmetic operator can also add a number, in days, to a date.

Topic link icon Transact-SQL Syntax Conventions

-- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse  
    
expression + expression  

expression
Is any valid expression of any one of the data types in the numeric category except the bit data type. Cannot be used with date, time, datetime2, or datetimeoffset data types.

Returns the data type of the argument with the higher precedence. For more information, see Data Type Precedence (Transact-SQL).

A. Using the addition operator to calculate the total number of hours away from work for each employee.

This example finds the total number of hours away from work for each employee by adding the number of hours taken for vacation and the number of hours taken as sick leave.

-- Uses AdventureWorks  
  
SELECT p.FirstName, p.LastName, VacationHours, SickLeaveHours,   
    VacationHours + SickLeaveHours AS 'Total Hours Away'  
FROM HumanResources.Employee AS e  
    JOIN Person.Person AS p ON e.BusinessEntityID = p.BusinessEntityID  
ORDER BY 'Total Hours Away' ASC;  
GO  

B. Using the addition operator to add days to date and time values

This example adds a number of days to a datetime date.

  
SET NOCOUNT ON  
DECLARE @startdate datetime, @adddays int;  
SET @startdate = ''January 10, 1900 12:00 AM';  
SET @adddays = 5;  
SET NOCOUNT OFF;  
SELECT @startdate + 1.25 AS 'Start Date',   
   @startdate + @adddays AS 'Add Date';  

Here is the result set.

Start Date Add Date

--------------------------- ---------------------------

1900-01-11 06:00:00.000 1900-01-15 00:00:00.000

(1 row(s) affected)

C. Adding character and integer data types

The following example adds an int data type value and a character value by converting the character data type to int. If a character that is not valid exists in the char string, the Transact-SQL returns an error.

DECLARE @addvalue int;  
SET @addvalue = 15;  
SELECT '125127' + @addvalue;  

Here is the result set.

-----------------------

125142

(1 row(s) affected)

D: Using the addition operator to calculate the total number of hours away from work for each employee

The following example finds the total number of hours away from work for each employee by adding the number of hours taken for vacation and the number of hours taken as sick leave and sorts the results in ascending order.

-- Uses AdventureWorks  
  
SELECT FirstName, LastName, VacationHours, SickLeaveHours,   
    VacationHours + SickLeaveHours AS TotalHoursAway  
FROM DimEmployee  
ORDER BY TotalHoursAway ASC;  

Operators (Transact-SQL)
Compound Operators (Transact-SQL)
+= (Add EQUALS) (Transact-SQL)
CAST and CONVERT (Transact-SQL)
Data Type Conversion (Database Engine)
Data Types (Transact-SQL)
Built-in Functions (Transact-SQL)
SELECT (Transact-SQL)

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