[SQL] Doing a conditional aggregate (e.g. count(*) if x=y) in postgres?

[Bryce Nesbitt]

All;
Is there a way to get a conditional aggregate?  I have this two column view:

 SELECT count(*) AS count, xx_plan.plan_name
   FROM xx_membership
   JOIN xx_account USING (account_id)
   JOIN xx_plan USING (plan_id)
  WHERE xx_membership.status = 10
  GROUP BY xx_plan.plan_name;

And would like to add additional columns (not rows) breaking out
"status=20" and "status=30" totals.
Is this possible without a stored procedure?


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