On Fri, Apr 2, 2010 at 1:59 PM, Igor Tandetnik itandet...@mvps.org wrote:
Fredrik Karlsson wrote:
Sorry for asking this SQL question, but I just have to make sure:
- Aliases in subqueries - are the always, local to the scope of the
subquery?
That is, if I have this query (this example makes _no_ sense, I know.
Just an illustration.):
select target.* from
(
select target.* from
(select m.id, n. name from mytable m, myothertable, n where
m.id = n.id) target,
(select m.id, n. name from mytable m, myothertable, n where
m.id = n.id) comp1,
where target.id = comp1.id
) target,
mytable t
where t.id = target.id;
will the aliases at the different levels be safe inside of their
subquery so that e.g. target in the outer query will be intact once
the subquery has been evaluated?
Yes. Apart from a misplaced comma here and there, this statement should work.
--
Igor Tandetnik
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Hi,
Excellent! Thank you for having a look at this.
/Fredrik
--
Life is like a trumpet - if you don't put anything into it, you don't
get anything out of it.
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