+ (Add)
Adds two numbers. This addition arithmetic operator can also add a number, in days, to a date.
Syntax
expression + expression
Arguments
expression
Is any valid Microsoft® SQL Server™ expression of any of the data types 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.
Examples
A. Use the addition operator to calculate the total units available for customers to order
This example adds the current number of products in stock and the number of units currently on order for all products in the Products table.
USE Northwind
GO
SELECT ProductName, UnitsInStock + UnitsOnOrder
FROM Products
ORDER BY ProductName ASC
GO
B. Use the addition operator to add days to date and time values
This example adds a number of days to a datetime date.
USE master
GO
SET NOCOUNT ON
DECLARE @startdate datetime, @adddays int
SET @startdate = '1/10/1900 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
--------------------------- ---------------------------
Jan 11 1900 6:00AM Jan 15 1900 12:00AM
(1 row(s) affected)
C. Add character and integer data types
This example adds an int data type value and a character value by converting the character data type to int. If an invalid character exists in the char string, SQL Server returns an error.
DECLARE @addvalue int
SET @addvalue = 15
SELECT '125127' + @addvalue
Here is the result set:
-----------------------
125142
(1 row(s) affected)