On Mon, May 30, 2005 at 07:33:04PM +1000, Philip Rhoades wrote: > People, > > The following script works (I have confirmed it by doing two separate > views and doing a select on them) - but I don't understand why there > isn't a recursion problem with c1.policy and c2.policy - is there some > sort of trick happening?
"recursion problem" ? It's called a correlated subquery. SQL is declarative, you state what you want and the database figures out how to get the answer for you. I think you need to go and read up on the basics of SQL. If you want to see *how* the database is working out the answer, use explain and it'll display the query plan. Hope this helps, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a > tool for doing 5% of the work and then sitting around waiting for someone > else to do the other 95% so you can sue them.
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