mysql使用技巧之行类视图子查询

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film表为电影表，category表为电影分类表，film_category表为电影表与电影分类表的中间表(多对多的中间表)

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);

SELECT c.name, COUNT(f.film_id) AS amount FROM film AS f, film_category AS fc, category AS c, (SELECT category_id FROM film_category GROUP BY category_id HAVING COUNT(category_id) >= 5) AS cc WHERE f.description LIKE '%robot%' AND f.film_id = fc.film_id AND fc.category_id = c.category_id AND c.category_id = cc.category_id

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