Example: I have two tables: registration & schedules....
they both record a class_id, start_date, end_date... I want to make sure that if the schedule_id field is updated in the registration table; that class_id, start_date & end_date fields automatically change to match the schedules.id record in the schedules table.... I've devised a function to handle this but pgsql recognizes the query to be 'infinitely recursive:
CREATE RULE registration_update AS
ON UPDATE TO registration
DO
UPDATE registration SET class_id = schedules.class_id WHERE new.schedule_id = (SELECT schedules.id FROM schedules WHERE id = new.schedule_id);
What I'm doing is kind of redundant but necessary for backwards-compatibility
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