If a table A contains a foreign key to table B is it possible to have
a DELETE remove the targetted row in B when there are no longer any
other references in A to it? Either with SQL or using some other
PostgreSQL facility.
As an example,
Body:
body_id data
1 "some news"
Page:
page_id body_id name
10 1 "news"
11 1 "recent news"
If page_id=10 is deleted, nothing extra happens. If page_id=11 is
deleted, body_id=1 goes with it.
Many thanks, Paul
--
Paul Makepeace ....................................... http://paulm.com/
"If kangaroos graduate, then it shall rain in ghana on my sweet
potatoes."
-- http://paulm.com/toys/surrealism/
