Hi All, I've got one of these:
SELECT * from some_table WHERE test_for_equality_is_syntactically_ugly; What I'd like to do is encapsulate the WHERE clause in a function, but I'm having no end of trouble. The WHERE clause expects the function to return a boolean value. I can certainly return a boolean value from a function, but here it seems to me that what the function really has to do is return a set of boolean values -- the test in the WHERE clause sometimes evaluates to true and sometimes evaluates to false, and that is in turn used to constrain the query results. But you can't return a set of anything (I don't think) in a WHERE clause, because it seems to want a singular boolean value. Is it possible to do what I'm trying to do? I've written a few simple sql and pl/pgsql functions over the years, but I'm no expert. Perhaps I'm barking up the wrong tree here. It seems like what I really need is a way to have some kind of rewrite rule (e.g. when you see "foo(x)" substitute ugly string). Sort of like a Lisp macro ;) Steve -- Stephen Ramsay Assistant Professor Department of English University of Georgia email: [EMAIL PROTECTED] web: http://cantor.english.uga.edu/ PGP Public Key ID: 0xA38D7B11 ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org
