USE billing;
SET AUTOCOMMIT=0;

INSERT INTO contacts VALUES(NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 0, now(), now(), NULL);

SELECT LAST_INSERT_ID() INTO @contact_id;

UPDATE contracts c, resellers r SET c.contact_id = @contact_id WHERE c.id = r.contract_id and c.contact_id IS NULL;

COMMIT;