On Wed, Aug 03, 2005 at 09:40:26AM -0400, Kevin Murphy wrote: > You have to wrap a scalar subquery in its own parentheses even where you > might think it to be unnecessary, such as when the subquery is the sole > argument to a function. It first guess I imagine it is because the syntax becomes ambiguous, expecially if you have multiple arguments to the function. Say you a function "func" and your query was: SELECT * FROM x ORDER BY y Then this isn't parsable obviously: SELECT func( SELECT * FROM x ORDER BY y, 1, 1 ) ) Since you don't know where the ORDER BY ends and the function list continues. Adding parenthesis at the appropriate point removes the ambiguity. Hope this helps, -- Martijn van Oosterhout <kleptog@xxxxxxxxx> 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.
Attachment:
pgpd6SEwXA9nD.pgp
Description: PGP signature
