Function can be defined as a Sub Programs which Performs an action this can be called from other Programs. Function should return Value.
Eg.1
CREATE FUNCTION NETSAL (@BPAY INT, @HRA INT, @DA INT)
RETURNS INT
BEGIN
RETURN (@BPAY+@HRA+@DA)
END
Calling Program
DECLARE @NS INT
EXEC @NS = NETSAL 4000, 3000, 2000
SELECT @NS ‘NET SALARY FOR THE EMPLOYEE’
O/P – NET SALARY FOR THE EMPLOYEE 9000
Eg: 2
CREATE FUNCTION CALC (@N VARCHAR (20))
RETURNS INT
BEGIN
DECLARE
@SAL INT, @COMM INT
SELECT @SAL=SAL FROM EMPLOYEES WHERE ENAME = @N
SET @COMM = SAL * .1
RETURN @COMM
END
Calling Program
DECLARE @C INT
EXEC @C AS ‘Commission For The Employee’
Dropping a Function
DROP FUNCTION NETSAL
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