"y.y.chen" <segma.yychen@msa.hinet.net> writes:
> When I run SQL -scripts in trigger/PlpgSQL:
> IF (TG_OP = 'INSERT') OR (old.size<>new.size) THEN
> .......
> END IF;
> It raise a exception: RECORD old never be defined,
> while TG_OP is 'INSERT'.
Yup, that's how it works. SQL OR is not guaranteed to be short-circuit
in the same way it is in some programming languages. You need to use
nested IF statements to make this work safely.
regards, tom lane
