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Update field with count

Author

Topic

Vack
Aged Yak Warrior

530 Posts

Posted - 2009-05-27 : 09:19:25

I want to count records in one table(orderrebatehistory) and update another table(orhrecordcount) with the count.

I've tried this but the update is not working.

update orhrecordcount
set recordcount = (select count(*) from orderrebatehistory)

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2009-05-27 : 09:23:36

You may need something like this

update t1
set recordcount = (select count(*) from orderrebatehistory where keycol=t1.keycol)
from orhrecordcount as t1

Madhivanan

Failing to plan is Planning to fail

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2009-05-27 : 09:25:36

or

update t1
set recordcount = t2.count
from orhrecordcount as t1 inner join
(
select keycol,count(*) as count from orderrebatehistory
group by keycol
) as t2
on keycol=t1.keycol

Madhivanan

Failing to plan is Planning to fail

Vack
Aged Yak Warrior

530 Posts

Posted - 2009-05-27 : 09:26:36

I do not have a key in my orhrecordcount table. I was just using it as a place to store the count. One record one field.

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2009-05-27 : 09:31:27

What was wrong with your query?
Did you get error?

Madhivanan

Failing to plan is Planning to fail

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2009-05-27 : 09:31:33

quote:
Originally posted by Vack

I do not have a key in my orhrecordcount table. I was just using it as a place to store the count. One record one field.

is it for temporary storage ? Why use a table ? an integer variable will be able to do that


declare @cnt int

select @cnt = count(*)
from   orderrebatehistory

KH
[spoiler]Time is always against us[/spoiler]

Vack
Aged Yak Warrior

530 Posts

Posted - 2009-05-27 : 09:33:03

I added a key column to the orhrecordcount and that seemed to have solved my problem.

Thanks

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-05-27 : 09:42:38

quote:
Originally posted by Vack

I added a key column to the orhrecordcount and that seemed to have solved my problem.

Thanks

why use a table just to store a count value?

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