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
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