題目描述

film表

CREATE TABLE IF NOT EXISTS film (
film_id smallint(5)  NOT NULL DEFAULT '0',
title varchar(255)
 
 NOT NULL,
description text,
PRIMARY KEY (film_id));

category表

CREATE TABLE category  (
category_id  tinyint
 
(3)  NOT NULL ,
name  varchar(25) NOT NULL, `last_update` timestamp,
PRIMARY KEY ( category_id ));

film_category表

CREATE TABLE film_category  (
film_id  smallint(5)  NOT NULL,
category_id  tinyint(3)  NOT NULL, `last_update` timestamp);

使用子查詢的方式找出屬於Action分類的所有電影對應的title,descriptio

題解

使用子查詢

select title, description from film as f
where f.film_id in(
select fc.film_id from film_category as fc
where fc.category_id in (
select c.category_id from category as c
where c.name = 'Action'))