Matching all values in IN clause

You can do something like this:

select ItemID
from ItemCategory
where CategoryID in (5,6,7,8) <-- de-dupe these before building IN clause
group by ItemID
having count(distinct CategoryID) = 4 <--this is the count of unique items in IN clause above

If you provide your schema and some sample data, I can provide a more relevant answer.

SQL Fiddle Example

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