[GENERAL] Requirements for Constraint Trigger's Function

[Richard Broersma Jr]

What is the proper way for the function of a constraint trigger to signal where 
or not referential integrity was compromised?

Should it return some sort of value?  Should it raise an exception?

Regards,
Richard Broersma Jr.

---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match