Hello Raymond and others, thank you for looking at my problem! It is a core Drupal 7 table, with a prefix "drupal_" (you can set it while installing Drupal 7 in adv. options). I have only 2 records in that target table: # select uid, name, mail, created, access from drupal_users; uid | name | mail | created | access -----+------+----------------------------+------------+------------ 0 | | | 0 | 0 1 | Alex | Alexander.Farber@xxxxxxxxx | 1299512207 | 1299753672 (2 rows) I've tried you suggestion and the conflicting record is 'Alex': # select username, user_id from phpbb_users where exists (select 1 from drupal_users where drupal_users.name = phpbb_users.username); username | user_id ----------+--------- Alex | 2 (1 row) But isn't that record excluded by the conditions below? # INSERT INTO drupal_users (uid, name, mail, created, access) SELECT user_id, username, user_email, user_regdate, user_lastvisit FROM phpbb_users WHERE user_id > 50 and length(username) > 0 and username <> 'Alex'; ERROR: duplicate key value violates unique constraint "drupal_users_name_key" -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
