A PL/PgSQL Question

Hi:

I have the following PL/PgSQL code blocks:

a) IF (condition) THEN     RAISE EXCEPTION ''Cannot Insert'';  END IF;

b) IF (condition) THEN     RAISE NOTICE ''Cannot Insert'';     RETURN NULL;  END IF;

  What is the difference between the first and second
chunk PL/PgSQL INSERT/UPDATE trigger function code
aside from the fact that first scenario will result in
an "ABORT" state?
 Are there any instances where a NOTICE and a RETURN
NULL statement is a much better than a RAISE EXCEPTION
statement?


Thank you very much,

ludwig lim



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