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Introduction

Tod ay we are going to play around with t he M agic Table in SQL Server. W hen we perform an insert or up dat e operationon any table then t he data is put into tables of in serted and d eleted d ata. These inserted and up dat ed t ables are know n

as M agic Tables or Virtu al Table.

I assum e you have basic kno wledg e of Sto red Procedures. For m ore help visit, Triggers in SQL Server.

First of all we create a table nam ed emp

Creation of table:

createtableem p (empId int , empNamevarchar(15))

Insertion of data:

insert into em p

select 1,'d 'union al l

select 2,'e'union al l

select 3,'e'union al l

select 4,'p 'union al l

select 5,'a'union al l

select 6,'k'

Output:

select * from em p

M agic Table:

These are Virtual Tabl es nam ed inserted and upd ated t hat are created b y SQL Server when we perfo rm an insert, delete

or u pd ate op eratio n. We can't see the M agic Table directly, We use a trigg er to see the Mag ic Table.

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Type of M agic Table:

Inserted1.Deleted2.

M agic Table for insert operation:

W hen we insert d ata into a table th en data is first in serted in t he inserted t able.

W e can use the follow ing t rigg er to see the inserted M agic Table.

createt r iggermajic_insert

o nem p

fo rinsert

as

select * from inserted

Output:

insert into em p values(11,'d ' )

W hen we execute that com mand , the t rigg er magic_insert fires and shows the table inserted.

M agic Table for delete operation:

W hen we delete data from any table then data is put into the deleted table.

By using follo wing trig ger we can see the deleted M agic Table.

createt r iggermagic_delete

o nem p

fo rdelete

as

select * from deleted

Output:

deletef rom em p whereempId= 11

W hen we execute th at com mand the t rigg er magic_delete fires and shows the table deleted.

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M agic Table for update operation:

W hen we perfo rm an upd ate operatio n then data from the first t able is deleted first, then after that the new upd ated

dat a is insert ed.

By using follo wing trig ger we can see the inserted and d eleted M agic Table.

createt r iggermagic_update

o nem p

fo rupdate

as

select * from inserted

select * from deleted

Output:

updateem p set empName= 'deepak' whereempId = 1

W hen we execute th at com mand the t rigg er magic_upd ate fires and shows the tables inserted and d eleted.

Summary:

In th is article I described M agic Table in SQL Server. I hop e this article has helped y ou t o un derstand thi s to p ic. Please

share if yo u kno w m ore abo ut t his. Your feedb ack and co nstruct ive cont ribut ions are welcom e.

Thank you for using M indcracker Netw ork

c Table in SQL Server 2012 http://www.c-sharpcorner.com/UploadFile/63f5c2/magic-table-in-sq

12/20/2012