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join查詢方式找出沒有分類的電影id以及名稱

SELECT
	film_id,
	title
FROM
	film
WHERE
	film_id NOT IN (
		SELECT
			film_id
		FROM
			film_category
	);