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Subquery vs. expression

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Topic

dmilam
Posting Yak Master

185 Posts

Posted - 2010-06-08 : 12:30:57

I can't figure out why these two counting queries should give me different results:


declare @Tmp table
(String varchar(50))
insert into @Tmp (String)
select 'a10'
union all
select 'a09'
union all
select 'a08'

select count(distinct(c.id)) as 'select * from @Tmp'
from Db1.dbo.Table1 as c
where c.name in (select * from @Tmp) --use subquery
and c.orderstatusname in ('Shipped','Taken','Back-Ordered')
and c.OrderType = 'Regular'

select count(distinct(c.id)) as 'a08,a09,a10'
from Db1.dbo.Table1 as c
where c.name in ('a08','a09','a10') --use expression [OR]
and c.orderstatusname in ('Shipped','Taken','Back-Ordered')
and c.OrderType = 'Regular'

I get a higher number from the first query.

dmilam
Posting Yak Master

185 Posts

Posted - 2010-06-08 : 12:37:16

Nevermind. There was a typo in my original query, not reproduced in the edited version I have used here.

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