Introduction:
Here I will explain the difference between stored
procedure and function in SQL
Server.
Description:
In previous posts I explained difference between Left Join and Left Outer Join, Difference between Len and DataLength and many articles
relating to SQL Server. Now I will explain the difference between stored
procedure and function in SQL
Server.
Stored
Procedure is a group of sql statements that has been created once and stored in
server database. It’s pre-compile
objects which are compiled for first time and its compiled format is saved
which executes (compiled code) whenever it is called. Stored procedures
will accept input parameters so that single stored procedure can be used over
network by multiple clients using different input data. Stored procedures will
reduce network traffic and increase the performance. (Read more Here)
Function:
Function is not pre-compiled object it will execute every
time whenever it was called.
Difference between Stored Procedure and
Function
1)
Procedure can return zero or n values whereas function can return one value
which is mandatory (Read more Here).
2)
Procedures can have input, output parameters for it whereas functions can have
only input parameters.
3) Procedure allows select as well as DML(INSERT/UPDATE/DELETE) statements in it whereas function allows only select statement in it.
4) Functions can be called from procedure whereas procedures cannot be called from function.
5) Exception can be handled by try-catch block in a procedure whereas try-catch block cannot be used in a function.
6) We can go for transaction management in procedure whereas we can't go in function.
7) Procedures cannot be utilized in a select statement whereas function can be embedded in a select statement.
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6 comments :
I do not understand this answer: Procedures cannot be utilized in a select statement whereas function can be embedded in a select statement.
You can help me an example for above answer. Thanks so much!
Hi, heroman,
U can call store procedure using,
exec procedureName
but u call function using,
select functionName....
Such a nice explanation
Got Confused After reading below article. Can you please explain?
Ref:
http://msdn.microsoft.com/en-us/library/aa214485%28v=sql.80%29.aspx
CREATE FUNCTION LargeOrderShippers ( @FreightParm money )
RETURNS @OrderShipperTab TABLE
(
ShipperID int,
ShipperName nvarchar(80),
OrderID int,
ShippedDate datetime,
Freight money
)
AS
BEGIN
INSERT @OrderShipperTab
SELECT S.ShipperID, S.CompanyName,
O.OrderID, O.ShippedDate, O.Freight
FROM Shippers AS S INNER JOIN Orders AS O
ON S.ShipperID = O.ShipVia
WHERE O.Freight > @FreightParm
RETURN
END
very nice tutorial
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