Re: Addition and subtraction on BIT type

Hello,
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.
Thanks,
Yasir

On Sun, 16 Nov 2003, Yasir Malik wrote:

> Date: Sun, 16 Nov 2003 11:18:03 -0500
> From: Yasir Malik <ymalik@cs.stevens-tech.edu>
> To: pgsql-sql@postgresql.org
> Subject: Addition and subtraction on BIT type
>
> Hello,
> Is there a way to do addition and subtraction on BIT types?  For example,
> for
> creat table test (a BIT(3));
> insert into test values (B'101');
>
> select a + 1 from test; fails
>
> and select a::smallint + 1 from test; also fails.
>
> In addition, is there a way to change the bit of a bit string?  For
> example change a 1 to a 0 or vice versa.
>
> Any suggestions?
> Thanks,
> Yasir
>