tomullus 69522 (7/29/2015)
I think i was misunderstood. I made a mistake in the original post by copying the wrong query into it. The current post (after my edit) is the actual issue. My original intention was for the query inside the IF statement be identical to the first one.I'm well aware of the concerns when using NOLOCK and a WHERE instead of a JOIN, but it isn't the core of the issue. I'd like to know how is it that a query that runs reasonably fast takes forever when put inside a simple IF statement.
Well your table has no indexing. Depending on the volume of data I would be surprised if anything ran acceptably fast.
I would suggest completely reworking that query. The <> is nonSARGable but you can use a < which is SARGable. Also, using EXISTS instead of COUNT makes this a lot clearer what you are trying to do. See if something like doesn't help.
if EXISTS
(
select *
From table1 v
inner join
(
select name
, max(somedate) as correct_date
From table1
group by name
) z on v.name = z.name and correct_date < somedate
)
select 1
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