Richard Broersma Jr <[EMAIL PROTECTED]> writes:
> So is the purpose of knowing the reference_table OID, is that it helps to 
> generalize the logic of the CONSTRAINT TRIGGERS?

No, the purpose is to support foreign-key triggers.  FK constraints are
implemented via cooperating triggers on the two tables, and each trigger
has to be able to look at the other table.

                        regards, tom lane

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