SQL Server: In cause with dynamic content

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SQL-Server-2012

Hi, I want to use In cause with dynamic variable,

Example :

declare @MultipleCategory nvarchar(20)
set @MultipleCategory ='2,3'

select video.videoid from video join category on videoid=category.videoid
WHERE category.CategoryID IN (@MultipleCategory)

but it is not working.

I know i can use dynamic SQL but it will competitive, if we have large query.

Posted 30-Nov-15 22:13pm

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Jörgen Andersson · Answer 1 · 2015-11-30T22:31:00

Solution 1

The short answer is: You can't.

But there are plenty of workarounds. Erland Sommarskog[^] to the rescue.

Posted 30-Nov-15 22:31pm

Jörgen Andersson

Andy Lanng · Answer 2 · 2015-11-30T22:36:00

First, it is a clause, not cause ^_^

Second, the "in" clause works off of a set of inputs, that is a table like structure with one column. What you have in your "in" clause is one item. A varchar.

If it was written like this:

SQL

WHERE category.CategoryID IN (2,3)

That would work. You have:

SQL

WHERE category.CategoryID IN ('2,3') which won't even match by type.

If you must use a csv to pass in your list, then you will need to convert it into a table column. You can use a csv parser Table Valued Function for this. Many examples exist and I will link one at the bottom.

This can be used as follows:

SQL

WHERE category.CategoryID IN ([dbo].[GetMyTable](@MultipleCategory))

here is the link:
SQL function to return CSV as a table[^]

The function steps through the string one char at a time so it quite scaleable