Thank you for your reply. select int4(b'1001')::bit(32); gives the same result as what you gave. select int4(b'1001')::bit(4); gives the upper four bits, which are all zeroes. How would I get the lower four bits? I building bitmaps using plpgsql, and therefore, I will be doing a lot bit manipulation. Thanks, Yasir
On Sun, 16 Nov 2003, Stephan Szabo wrote: > Date: Sun, 16 Nov 2003 21:40:45 -0800 (PST) > From: Stephan Szabo <[EMAIL PROTECTED]> > To: Yasir Malik <[EMAIL PROTECTED]> > Cc: [EMAIL PROTECTED] > Subject: Re: [SQL] Addition and subtraction on BIT type > > On Sun, 16 Nov 2003, Yasir Malik wrote: > > > I think I am almost at a solution to my last question. I can do > > select int4(a) from test; > > to convert to an integer. So now addition and > > subtraction can be done between bit types. But how do I convert back to > > BIT type? If I do > > select bit(int4(b'1001')); > > > > I get the following message: > > ERROR: parser: parse error at or near "int4" at character 12 > > > > Can anyone tell me why the bit function is not working? It's under the > > pg_catalog schema. > > It's also the name of a type that takes a precision in parentheses, so > you'd have to say "bit"(...) with the quotes. As a note, I think > that's going to effectively return you a bit(32), so > > sszabo=# select "bit"(int4(b'1001')); > bit > ---------------------------------- > 00000000000000000000000000001001 > > > ---------------------------(end of broadcast)--------------------------- > TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED] > ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
