SQL help doing query inside select

I need to modify some TSQL. Current code does something like this:

select c.rs_id
from a_of a, b_of b, c_of c
where a.o_id=b.o_id and a.bstat IN ("X", "Y")

I need to get a.user_id and use it to find c.mkt_ind. How can I modify this to have a query within a query?

I've heavily modified the original code.  This is just the general idea.
roujeskyAsked:
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dqmqCommented:
I wouldn't describe that as a "query within a query"... simply a join.

Modernize your SQL like this:


select c.rs_id, c.mkt_ind
from a_of a
inner join b_of b on a.o_id=b.o_id
inner join c on a.user_id = c.user_id     <--guessing here, see note below
where a.bstat IN ("X", "Y")

This join clause needs to identify the proper relationship between tables a and c
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roujeskyAuthor Commented:
thanks!
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Microsoft SQL Server 2005

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