On Sun, Dec 20, 2015 at 11:39 PM, Sterpu Victor <victor(at)caido(dot)ro> wrote:
> Thank you.
>
> I used the syntax with 2 indexes, it works for me.
> But why does NULL != NULL?
Because NULL literally means "an unknown, possibly unknowable value."
You need to stop thinking of NULL as A value. It is not.