Ovid wrote on 24.01.2010 14:43:
Assuming I have the following table:CREATE TABLE refers ( id SERIAL PRIMARY KEY, name VARCHAR(255) NOT NULL, parent_id INTEGER NOT NULL, FOREIGN KEY (parent_id) REFERENCES refers(id) ); I need to insert two records so that "select * from refers" looks like this: =# select * from refers; id | name | parent_id ----+------+----------- 1 | xxxx | 1 2 | yyy | 2 The first record can't be inserted because I don't yet know the parent_id.
I ususally identify the root record by setting the parent_id to NULL. In my experience creating a cycle in the tree creates a lot of trouble that is hard to come by. Thomas -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
