On Thu, Mar 10, 2005 at 12:44:50PM -0500, Tom Lane wrote:
>
> Would those of you with access to other DBMSes try this:
>
> create table tab (col integer);
> select 1 from tab having 1=0;
> select 1 from tab having 1=1;
> insert into tab values(1);
> insert into tab values(2);
> select 1 from tab having 1=0;
> select 1 from tab having 1=1;
>
> I claim that a SQL-conformant database will return 0, 1, 0, and 1 rows
> from the 4 selects --- that is, the contents of tab make no difference
> at all.
Sybase ASE version 12.5.2 returns 0, 0, 0, and 1 rows.
A plain "select 1 from tab" returns zero rows when tab is empty.
--
Mark Shewmaker
mark@primefactor.com
