Prevent Insert Trigger

Question

How can I get this trigger to prevent the insert where the advance is not greater than 0 or less than 100? Thanks.

DROP TRIGGER CheckAdvance;
CREATE OR REPLA         


        

Answer 1

You shouldn't use a trigger for this. Oracle (and SQL in general) supports check constraints:

alter table titles
    add constraint chk_titles_advance check (advance > 0 and advance <= 100);