On Tue, Jun 25, 2002 at 14:35:16 -0400, Tom Lane <[EMAIL PROTECTED]> wrote: > Bruno Wolff III <[EMAIL PROTECTED]> writes: > > Is there a simple way to do something like the following: > > create unique index inst_u_app on inst (lower(host), psport); > > > It looks like you can have an index on several columns, but not > > several functions. > > The standard answer is to make a custom function that accepts all the > columns and produces a result you can index. > > This is sort of an academic "an existence proof is good enough" answer, > but it *is* possible to get the results you want. Making it more > convenient hasn't risen to the top of anyone's to-do list.
It probably isn't worth the trouble in this case. The number of rows is small and I will use a unique index without forcing a case independpent comparison. For the time being this is good enough. Thanks for confirming that I was reading the manually correctly. ---------------------------(end of broadcast)--------------------------- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/users-lounge/docs/faq.html
