Re: static virtual columns as result?

PV  wrote:

> Any suggestion?

You provided too little information to suggest much beyond using JOIN
instead of a subquery.  Something like:

SELECT pr.id, pr.catid, cat.a, cat.b
  FROM pr join cat ON (cat.id = pr.catid)
  WHERE "lft" > 1 AND "rgt" < 10 AND (...)
  ORDER BY cat.id
  OFFSET 0 LIMIT 40;

We can provide more specific suggestions if you follow the advice
here:

http://wiki.postgresql.org/wiki/SlowQueryQuestions

And please format your queries to make them more readable --
something like I did above.

-Kevin