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 Multiple joins
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maevr
Posting Yak Master

Sweden
169 Posts

Posted - 10/16/2012 :  10:02:47  Show Profile  Reply with Quote
I need to write a query that selects records from multiple tables including a subquery but I belive I do something wrong since the select takes "forever" to run and the tempdb fills up quickly.

Smaller example:

select
a.id
,a.col2
,fa.col3
,fa.col4
,e.col5
,e.col6
,f.col7
from tbl1 a inner join
(select a1.id, b1.col2, c1.col3 from subTbl1 a1 inner join subTbl2 b1 on a1.id = b1.id inner join subTbl3 c1 on b1.id = c1.id
where a1.val = 'Yes') as fa
on a.id = fa.id inner join tbl2 e on a.id = e.id
inner join tbl3 f on a.id = f.id

visakh16
Very Important crosS Applying yaK Herder

India
52317 Posts

Posted - 10/16/2012 :  23:13:03  Show Profile  Reply with Quote
did you check the execution plan? what are the indexes table have?

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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