查找描述信息中包括robot的电影对应的分类名称以及电影数目，而且还需要该分类对应电影数量>=5部

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));

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

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

select name,count(fc.film_id) from (select fc.category_id,count(f.film_id) ac from film f left join film_category fc on f.film_id = fc.film_id group by category_id having count(f.film_id) >= 5) ac,film f,film_category fc,category c where f.film_id = fc.film_id and fc.category_id = c.category_id and c.category_id = ac.category_id and description like '%robot%';

select fc.category_id,count(f.film_id) ac from film f left join film_category fc on f.film_id = fc.film_id group by category_id having count(f.film_id) >= 5;