创建一个引用其他表的表

Created: November-22, 2018

在此示例中，用户表将具有引用 Agency 表的列。

CREATE TABLE agencies ( -- first create the agency table
  id SERIAL PRIMARY KEY,
  name TEXT NOT NULL
)

CREATE TABLE users (
  id SERIAL PRIMARY KEY,
  agency_id NOT NULL INTEGER REFERENCES agencies(id) DEFERRABLE INITIALLY DEFERRED -- this is going to references your agency table.
)