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  3. August 2017

Re: Idiomatic SQL empty set?

On Fri, Aug 4, 2017 at 4:29 PM, <dlclark@xxxxxxxxxxxxxxxx> wrote:
Well, I already tried null before starting this thread, and got the
"Column or global variable NULL not found" message.

In that case, select 1 from sysdummy where 1 <> 2; won't work,
either, because that returns a null.

Dave, are you actually trying these things or just shooting from the
hip? First of all, the system isn't guaranteed to have SYSDUMMY, but
it normally comes with SYSDUMMY1. Second, 1 <> 2 is always true, so if
the table isn't empty, the selection won't be empty.

But let's excuse all of that. The technique I proposed DOES work. How
do I know? Because I tried it.

John Y.

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