Programming in MS SQL Server 2012

Scalar Function

User-defined scalar functions return a single data value of the type defined in the RETURNS clause. For an inline scalar function, there is no function body, the scalar value is the result of a single statement.
CREATE Function
The following example describes CREATE Scalar user-defined function.

-- Example 87 --

USE EBusiness

IF EXISTS (SELECT *

FROM sysobjects

WHERE name = N'EmployeeName')

DROP FUNCTION EmployeeName

CREATE FUNCTION EmployeeName()

RETURNS varchar(100)

BEGIN

RETURN 'Prem Nath R.K'

END

-- Execute Scalar User-defined Function --

SELECT EBusiness.dbo.EmployeeName()

SELECT EBusiness.dbo.EmployeeName() AS 'Employee Name'

SELECT 'Employee Name' = EBusiness.dbo.EmployeeName()

EXECUTE Function
To execute / call a user-defined function, you must specify the database in which it was created and the dbo.factor like DatabaseName.dbo.FunctionName( )
Query Output Screen

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