On Thu, 10 Mar 2005, 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. (MySQL returns 0, 0, 0, and 2 rows, so they are definitely
> copying our mistake...)
DB2 (version 8.1) gives 0, 1, 0, 1.
- Heikki
