How to delete data from multiple tables?

Question

I have these tables:

event     (evt_id, evt_code, reg_id)

magnitude (mag_id, evt_id, value)

trace     (trace_id, pt_id)

point     (         


        

Answer 1

If the rows you want to delete can be envisioned as a hierarchy, you could define FOREIGN KEY constraints for the relationships with the ON DELETE CASCADE clause. Deleting the row at the top will then cascade down and delete them all.

http://www.postgresql.org/docs/9.1/static/ddl-constraints.html#DDL-CONSTRAINTS-FK