INSERTED table

I have a qn regarding the INSERTED table.

Whenever a row is inserted into the table i understand that the INSERTED table also gets that particular row. But how long does that particular row stay thr? Till another new row is inserted into the table? which means that rows get overwritten whenever a row is inserted?

Hope everyone understands what i am trying to say. Would be kind of you to reply.thanks!

GayathriPlease provide an example of the sql.|||SELECT JobNumber
from inserted
where ServiceType = 'On-site' and ServiceStatus = 'NEW' and DateModified=(SELECT MAX(DateModified) from inserted)

when i execute this statement alone i will only get one job number but when i put this into a trigger and channel the output into a cursor to copy it into a variable it selects some other job number as well...This is the whole code

DECLARE job_number_cursor CURSOR FOR
SELECT JobNumber
from inserted
where ServiceType = 'On-site' and ServiceStatus = 'NEW' and DateModified=(SELECT MAX(DateModified) from inserted)
OPEN job_number_cursor
FETCH NEXT FROM job_number_cursor INTO
@.job_number

CLOSE job_number_cursor
DEALLOCATE job_number_cursor

I was hoping to get just one output since i thought the INSERTED table only contains the last inserted row.|||I understand what you are asking...

Basically you are saying,...

When a table has a trigger on it the trigger has access to a table called inserted (assuming it is an insert trigger). How long does the inserted table with the insert record exist...

In all honesty, I'm not sure, but I would say it would exist until the insert and the associated trigger (if there is one) has been completed...

I'll look up some resources and see what I can find.|||Um,... question,... when you use your cursor are you doing an update or insert into the table with the trigger on it??|||I am inserting|||okie,... so lets think about that for a sec...

you are in the middle of an insert, your trigger fires which opens a cursor which does an insert (loop to start and insert a new record into the inserted table)

your cursor is still open when you do your second insert and it references the same inserted table... which now has the new record in it...

does that make sense??|||Check out your bol:

The inserted table stores copies of the affected rows during INSERT and UPDATE statements. During an insert or update transaction, new rows are added simultaneously to both the inserted table and the trigger table. The rows in the inserted table are copies of the new rows in the trigger table.|||and I assume they get cleaned out once the insert is complete... including trigger execution...|||rnealejr ,I understand that INSERTED table stores copies of the rows inserted into the actual table...

So does this mean that everytime an insert or update statement is executed a new inserted table is formed?|||I think the table remains but the rows are removed after the action is completed.

The reason I think this is because according to the BOL you can reference the deleted table when doing an insert and the inserted table when doing a delete but there are no rows contained in the tables...

"When you set trigger conditions, use the inserted and deleted tables appropriately for the action that fired the trigger. Although referencing the deleted table while testing an INSERT, or the inserted table while testing a DELETE does not cause any errors, these trigger test tables do not contain any rows in these cases."|||You can have more than 1 record in the inserted table and the table is only accessible to the trigger - so the table exists as long as the trigger runs for a particular sql statement.|||So does this mean that everytime an insert or update statement is executed a new inserted table is formed?

These tables are created/stored in memory. From what I remember, I believe the scope of these virtual tables are for the life of the trigger. It would not make sense that ss would keep a table in memory any longer than needed.|||It's highly possible that they continue to exist after their usefulness has gone, after all we are talking a microsoft product and they have done stranger things in the past.

Also the amount of memory you are talking about is minimal so the effect of keeping the table alive in memory is unlikely to cause any real problems.

In fact, it is likely that the over head involved in creating the tables each time if more detrimental then kepeing them in memory especially when you consider that you are likely to do multiple updates/inserts/deletes on any given table at a time rather then constant swap around tables ...|||The inserted and deleted tables exist only within the scope of the trigger execution. Updates use both the inserted and deleted tables because they effectively insert new modified copies of the records and then delete the old ones.

gayamantra, the inserted table does not exist as a distinct and persistent object. Keep in mind that it has the same record format as whatever datatable was the subject of the operation.

New virtual tables of inserted and deleted records must be created (in memory only) for each operation, otherwise multiple users accessing the datatable would end up with their inserted/deleted records intermingling.

I would guess that there is little additional overhead in creating these virtual tables on the fly, because they may be incidental to the database server's operations anyway.|||"New virtual tables of inserted and deleted records must be created (in memory only) for each operation, otherwise multiple users accessing the datatable would end up with their inserted/deleted records intermingling."

Not necessarily, the tables could be created with a user context eg. they are specific to the user at the time... I don't really know though... lets be honest, there are quite a few methods that MS could be using... but for the nature of this discussion the inserted and deleted table exist for the duration of the insert or delete. :Dsql

Insert Trigger

I am facing problem in creating a insert trigger for the following scenario.

i have transactions, control tables

whenever i insert a record in transactions it should get value from the control table, increment that value in control table and update the same value as transaction_id for new transaction in transaction table.

control table has these fields (control_desc, control_value)

can some one help me to write a trigger (insert trigger) in transactions table.

Tanks for the Help

Coudl you please provide more information like DDL code, showing which column you want to update etc.

HTH, jens Suessmeyer.

http://www.sqlserver2005.de

|||

Thanks for the replay

Fields in Transactions Table : trans_id,trans_type,amount,trans_date,uid

Fields in Control Table: id, id_value

I am inserting all the fields in transction table except trans_id when insert trigger fires i want to take id_value from control table which id is "trans_id" in id coulmn update the same in the trans_id field in transactiontable.

Can u help me reating this trigger.

Regards

|||

Try this

--<Run Once>

drop table Transactions

drop table control

go

create table control

(

control_desc varchar(5) not null primary key,

control_value int not null

)

create table Transactions

(

trans_id int not null identity,

control_desc varchar(5) not null foreign key references control(control_desc),

control_value int not null

)

go

create trigger ti_Transactions on Transactions for insert

as

set nocount on

update c

set c.control_value = c.control_value + 1

from control c

join inserted i

on i.control_desc = c.control_desc

go

insert control select 'ABCDE', 10001

go

--</Run Once>

--<Repeatable>

insert transactions (control_desc, control_value)

select control_desc, control_value

from control

where control_desc = 'ABCDE'

go

select * from control

select * from transactions

--</Repeatable>

|||

The following query may help you...

Code Snippet

create table control (
id int,
id_value int)

Go

create table Transactions (
trans_id int,
trans_type int,
amount float,
trans_date datetime,
uid uniqueidentifier)

Go

Insert Into control values(1,0)--Initiating the value

Go

Create Trigger Trg_Insert_Transactions
On Transactions For Insert
As
Begin
SET NOCOUNT ON;
Declare @.Id as int;

Update control WITH (ROWLOCK)
Set
@.Id = Id_value = (Id_Value +1)
Where
id =1;
Update Transactions
Set
trans_id = @.Id
Where
uid = (Select Uid From Inserted)
End

Go

Insert Into Transactions values(null, 1, 10,getdate(),newid())

GO

select * from Transactions
select * from control

Insert Trigger

I am facing problem in creating a insert trigger for the following scenario.

i have transactions, control tables

whenever i insert a record in transactions it should get value from the control table, increment that value in control table and update the same value as transaction_id for new transaction in transaction table.

control table has these fields (control_desc, control_value)

can some one help me to write a trigger (insert trigger) in transactions table.

Tanks for the Help

Coudl you please provide more information like DDL code, showing which column you want to update etc.

HTH, jens Suessmeyer.

http://www.sqlserver2005.de

|||

Thanks for the replay

Fields in Transactions Table : trans_id,trans_type,amount,trans_date,uid

Fields in Control Table: id, id_value

I am inserting all the fields in transction table except trans_id when insert trigger fires i want to take id_value from control table which id is "trans_id" in id coulmn update the same in the trans_id field in transactiontable.

Can u help me reating this trigger.

Regards

|||

Try this

--<Run Once>

drop table Transactions

drop table control

go

create table control

(

control_desc varchar(5) not null primary key,

control_value int not null

)

create table Transactions

(

trans_id int not null identity,

control_desc varchar(5) not null foreign key references control(control_desc),

control_value int not null

)

go

create trigger ti_Transactions on Transactions for insert

as

set nocount on

update c

set c.control_value = c.control_value + 1

from control c

join inserted i

on i.control_desc = c.control_desc

go

insert control select 'ABCDE', 10001

go

--</Run Once>

--<Repeatable>

insert transactions (control_desc, control_value)

select control_desc, control_value

from control

where control_desc = 'ABCDE'

go

select * from control

select * from transactions

--</Repeatable>

|||

The following query may help you...

Code Snippet

create table control (
id int,
id_value int)

Go

create table Transactions (
trans_id int,
trans_type int,
amount float,
trans_date datetime,
uid uniqueidentifier)

Go

Insert Into control values(1,0)--Initiating the value

Go

Create Trigger Trg_Insert_Transactions
On Transactions For Insert
As
Begin
SET NOCOUNT ON;
Declare @.Id as int;

Update control WITH (ROWLOCK)
Set
@.Id = Id_value = (Id_Value +1)
Where
id =1;
Update Transactions
Set
trans_id = @.Id
Where
uid = (Select Uid From Inserted)
End

Go

Insert Into Transactions values(null, 1, 10,getdate(),newid())

GO

select * from Transactions
select * from control

sql