On Thu, Oct 13, 2005 at 05:05:56PM -0700, CSN wrote: > I'm trying to get this query to work: > > update sectors set companies =(select companies from industries > where sector_id =sectors.id); > > PG returns: > > ERROR: more than one row returned by a subquery used as an > expression It's doing what it should. Try the inner query for a few specific examples of sector_id. > > Column companies is just a count of rows in the related companies > table. Queries like this worked: > > update industries set companies =(select count(id) from companies > where industry_id =industries.id); The inner query is guaranteed to return exactly one row. The other one is not. > I know I could do a join in the subselect, but I'm curious why this > doesn't work. If I do the subselect by itself, it looks like all of > the rows from the industries table are return (I expected an error). > Is this the "implicit FROM" gotcha? Nope. Thinko on your end. Just make sure your inner query is guaranteed to return exactly one row, and you'll be good. :) Cheers, D -- David Fetter david@xxxxxxxxxx http://fetter.org/ phone: +1 510 893 6100 mobile: +1 415 235 3778 Remember to vote! ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
