On Sun, Dec 20, 2015 at 11:39 PM, Sterpu Victor <victor@caido.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.
Right. It would be sort of like asking: "is an object which I can't see the same as (==) or different from (!=) some other object which I can't see?" Answer: "How would I know???"
--
Computer Science is the only discipline in which we view adding a new wing to a building as being maintenance -- Jim Horning
Schrodinger's backup: The condition of any backup is unknown until a restore is attempted.
Yoda of Borg, we are. Futile, resistance is, yes. Assimilated, you will be.
