采取以下两个表:
Table "public.contacts"
Column | Type | Modifiers | Storage | Stats target | Description
--------------------+-----------------------------+-------------------------------------------------------+----------+--------------+-------------
id | integer | not null default nextval('contacts_id_seq'::regclass) | plain | |
created_at | timestamp without time zone | not null | plain | |
updated_at | timestamp without time zone | not null | plain | |
external_id | integer | | plain | |
email_address | character varying | | extended | |
first_name | character varying | | extended | | …