RE: Comma separate list as parameter

SSC Guru

Points: 186127

February 11, 2016 at 7:45 am

SQLNightOwl (2/11/2016)
You may want to consider performance differences between using an IN and an INNER JOIN
select columns
from dbo.sometable
where ItemCode in (select Item from #tempTable)
-- AND --
select columns
from dbo.sometable st
inner
join #tempTable tt
on st.ItemCode = tt.Item
... may yield different performance benchmarks. The differences could vary bases on the number of items in the temp table, if the temp table uses that value as a primary key and if the permanent table has a SARGable index. STATISTICS IO and TIME can give you some of that information.

It depends.

http://sqlinthewild.co.za/index.php/2010/04/27/in-exists-and-join-a-roundup/[/url]

Always study the execution plan, always test the alternative options, and always test on a set which is representative of production data and then some.

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden