Thanks for reply, trying this: invoice VARCHAR CONSTRAINT "CHECK(invoice != '';)" NOT NULL, or invoice VARCHAR CONSTRAINT "CHECK(invoice <> 0)" NOT NULL, but have no luck. There are too few examples on the web...
Thanks for reply, trying this: invoice VARCHAR CONSTRAINT "CHECK(invoice != '';)" NOT NULL, or invoice VARCHAR CONSTRAINT "CHECK(invoice <> 0)" NOT NULL, but have no luck. There are too few examples on the web...