Identifying the column match from an in clause

Greetings all,
I have a dynamic query which populates a pseudo lookup table. It can (currently) populated anywhere from 1 to 8 columns, with an associated description.
Joining to the results of this query I have a table containing a list of accounts. These accounts have two identifiers I can use to join the appropriate row in my dynamically fed lookup table. The first of these identifiers always appears in one column,
but the second can match any of the other columns.
the join looks like this:
inner join lookup
on PLID = PLID
and CV in (level0,level1,level2,level3...)
Not only would I like to clean up this join, but I also need to know which of the columns CV has matched too.
My first through was a case statement, but that would require me to know how many columns the dynamic table has, and adjust the query to reflect that each time.
case
when cv = level1 then 1
when cv = level2 then 2
end
So, my question is, does anyone have a nifty trick to solve either, or both of these problems?
Many thanks in advance.

Now that you understand the problem, perhaps we can get back to the original question of determining which values from an in operation was the match, where the values of the in are dynamic?
No, I don't yet understand the problem fully.
And there is nothing strange in this. Many of the problems we have to solve are complex, and it may be difficult to convey all information to a total stranger who have no information about business rules etc.
Particularly I don't know why think you need a dynamic result set. What I do know from experience is that working with something like a dynamic result set is painful, and that T-SQL is not intended for it. Therefore I tend to avoid solutions which produces
such beasts. And I really have to work with then, I do that client-side, and not in SQL.
There simply are no nice solutions to what you asked you for in your initial post. Therefore my advice was to reconsider what you have this far. I'm sorry if you found that advice rude.
What possibly may work in your case is that rather than having an unknown number of column, is to store all values in a string where each value takes up the same amount of space. (That is, you pad all ids or whatever you have.) Now you can use charindex
to see if you get a match, and where the match is.
Erland Sommarskog, SQL Server MVP, [email protected]

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Identifying the column match from an in clause

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