Re: sequential joins

Ok, here it is:
SELECT *
FROM
activity a
LEFT OUTER JOIN       (SELECT     username AS artistname,                           objectid AS userid       FROM
 user) u1
 
ON a.artist = u1.userid;

After this join, I would have a view, that contains original activity table
data, appended with column artistname, which would contain artist username,
referenced from this activity record.
If I join the result with       (SELECT     username AS programmername,                           objectid AS userid
  FROM         user) u2
 
ON a.programmer = u2.userid
I would have programmername column appended, containing programmers username,
etc.
I hope this clarifies the issue.
thanks,


Josh Berkus wrote:

> Oleg,
>
> > the sub-select statement I was using were not for filtering data (in
> >  which
> > case you can move filtering condition in ON part of the join), but
> >  rather
> > renaming the column 'username' with the name I need in the current
> >  join
> > statement. In this case, columns with new names ('artist',
> >  'designer',
> > 'programmer') would be appended to the overall query result and can
> >  be
> > selected by top-level select statement.
> > This looks like a very clumsy way to do what I need.
> > Any ideas?
>
> No, now I'm confused.  Can you explain better what you are trying to
>  achieve as a result?
>
> -Josh
>
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