1、在命令行登录指定数据库

2、创建表

CREATE TABLE weather (
    city            varchar(80),temp_lo         int,-- low temperature
    temp_hi         int,-- high temperature
    prcp            real,-- precipitation
    date            date
);

MysqL 的注释是：#
3、表的继承

CREATE TABLE cities (
  name       text,population real,altitude   int     -- (in ft)
);

CREATE TABLE capitals (
  state      char(2)
) INHERITS (cities);

SELECT name,altitude
  FROM cities
  WHERE altitude > 500;

   name    | altitude
-----------+----------
 Las Vegas |     2174
 Mariposa  |     1953
 Madison   |      845
(3 rows)

SELECT name,altitude
    FROM ONLY cities
    WHERE altitude > 500;

   name    | altitude
-----------+----------
 Las Vegas |     2174
 Mariposa  |     1953
(2 rows)