Tim Ellis <Tim.Ellis@gamet.com> writes:
> Yeh. Good question. I would assume their generator MEANT
> (max(autonum,0)+1) supposing that a "ANSI Level 2"-compliant server's
> max function might return the second value if the first is NULL. But no
> matter how you slice it, that looks syntactically wrong.
I suspected they meant COALESCE(max(autonum),0) + 1, which would be
correct since max() on no values is defined to produce NULL. I'm
not aware of any variant of max() that takes two arguments.
> Perhaps. Is the sequence object part of standard SQL? I know Postgres and
> Oracle have it (among others) but I also know of at least one major
> recent-version RDBMS that fails to have a sequence object.
It is not standard. On the other hand, expecting people to have
implemented every last frammish in SQL99 is a bit premature also...
SQL92 didn't have triggers at all.
regards, tom lane
