1. -----------------------User Degine Function---------------
----------------------------------------------------------
-- Type 1 > Scaler Functions : Returns single value.
--Ex: Factorial of Given No.
CREATE FUNCTION UDF_Factorial( @num int)
RETURNS int
AS
BEGIN
DECLARE @fact int
SET @fact=1
WHILE @num != 0
BEGIN
SET @fact=@fact * @num
SET @num=@num-1
END
RETURN @fact
END
-----------------------------------------------------------------
--Execute User Define Function
SELECT dbo.UDF_Factorial(5) as Factorial
------------------------------------------------------------------

2. --Ex: Function to Find Employee MAX Salary of Given Dept
CREATE FUNCTION UDF_getMaxSal(@Deptid int)
RETURNS NUMERIC(10,2)
AS
BEGIN
DECLARE @MaxSal NUMERIC(10,5)
SET @MaxSal=(SELECT TOP 1 Salary FROM tblEmployee WHERE DeptId=@Deptid ORDER
BY Salary DESC)
RETURN @MaxSal
END
GO
--Execution of UDF in SELECT Statment
SELECT EmpId,EmpName,Address,Deptid,Salary FROM tblEmployee WHERE
Salary=dbo.UDF_getMaxSal(2)

3. -- Type 2 > Inline Table Valued Function : Returns Table Object
--Ex: Function to Return Record of Emplyees whose Salary > given salry
CREATE FUNCTION UDF_getEmpRecordsAboveGivenSal(@Salary int)
RETURNS Table
AS
return (SELECT EmpId,EmpName,Address,Gender,Salary FROM tblEmployee WHERE
Salary > @Salary)
GO
-----------------------------------------------------------------------------
-- Execution
SELECT * FROM dbo.UDF_getEmpRecordsAboveGivenSal(25000)

4. -- Type 3 > Multi Statement Table Valued Function :
-- Explicitly defines the structure of the table to return.
-- Defines column names and datatypes in the RETURNS clause.
--Ex: Fuction to get Employee Records with Dept Name
CREATE FUNCTION getEmpByDeptName()
RETURNS @EmpWithDept Table
(
EmpId int,
EmpName varchar(50),
DeptName varchar(50)
)
AS
BEGIN
INSERT INTO @EmpWithDept SELECT e.EmpId,e.Empname,d.DeptName FROM
tblDepartment d INNER JOIN tblEmployee e ON d.DeptId=e.DeptId
return
END
GO
-----------------------------------------------------------------------------
-- Execute Multi Statement Table Valued Function
SELECT * FROM dbo.getEmpByDeptName()

5. --Modify or Alter UDF like Follows
Alter FUNCTION getEmpByDeptName(@DeptName varchar(50))
RETURNS @EmpWithDept Table
(
EmpId int,
EmpName varchar(50),
DeptName varchar(50)
)
AS
BEGIN
INSERT INTO @EmpWithDept SELECT e.EmpId,e.Empname,d.DeptName FROM
tblDepartment d INNER JOIN tblEmployee e ON d.DeptId=e.DeptId WHERE
DeptName=@Deptname
UPDATE @EmpWithDept SET DeptName='DOT NET' WHERE DeptName='.NET'
return
END
GO
-----------------------------------------------------------------------------
---------------------------------------------------
-- Execute Multi Statement Table Valued Function
SELECT * FROM dbo.getEmpByDeptName('.NET')

6. ----------------------------------Triggers-----------------------------------
-----------------------------------------------------------------------------
--Defination : A trigger is an action that is performed behind-the-scenes
when an event occurs on a table.
-- Types of Trigger: 1) Instead of/Before 2) After/For
-- There are Two Tables with Field and Diffrent name one is tblPersone and
another is tblPersonUpdate
SELECT * FROM tblPerson
SELECT * FROM tblPersonUpdate
-----------------------------------------------------------------------------
--Inserting Records into tblPerson
INSERT INTO tblPerson
VALUES('Vinay','Sayaji,Indore',Convert(Varchar,GETDATE(),114))
INSERT INTO tblPerson VALUES('Rahul','Vijay
Nagar,Indore',Convert(Varchar,GETDATE(),114))
INSERT INTO tblPerson
VALUES('Hitesh','Khargone',Convert(Varchar,GETDATE(),114))

7. SELECT * FROM tblPerson
SELECT * FROM tblPersonUpdate
--Creating Trigger on Table tblPerson After Update will Insert Old Record
into tblPersonUpdate
CREATE TRIGGER UDT_PersonUpdate
ON tblPerson
After UPDATE
AS
DECLARE @id int;
DECLARE @name varchar(50);
DECLARE @address varchar(50);
DECLARE @time varchar(50);
select @id=U.id from deleted U;
select @name=U.name from deleted U;
select @address=U.address from deleted U;
select @time=U.time from deleted U;
BEGIN
INSERT INTO
tblPersonUpdate(id,name,address,time)VALUES(@id,@name,@address,@time)
PRINT 'Record Has been Inserted into tblPersonUpdate'
END

8. --Now Updating in Table tblPersone
UPDATE tblPerson SET address='Bhopal' WHERE id=3
-----------------------------------------------------------------------------
--Now Updated Records in tblPerson and tblPersonUpdate
SELECT * FROM tblPerson
SELECT * FROM tblPersonUpdate