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Humm? I think because ( 0 = 1 ) included two places in each of your SELECT statements evaluates to False, then all of your SELECT statements evaluate to essentially

WHERE False AND something AND False

which further evaluates to

WHERE False

and thus produce nothing at all.

Humm? I think because ( 0 = 1 ) included two places in each of your SELECT statements evaluates to False, then all of your SELECT statements evaluate to essentially

WHERE False AND something AND False

which further evaluates to

WHERE False

and thus they produce nothing at all.