Helen,

> On what basis do you think FB could "smart-guess" or determine an

optimal sequence for two constraints that are unrelated to each other?

true

Also - even if Planets and Stars were related - FB could read my
command, but not my mind (at least not with version 1.0 ) :)

I mean that FB could decide the best route IF the intention of
emptying the 3 tables was clear.

But a command like

delete from Worlds

does not transmit the user's real intention :)

Thank you

Duilio