MySQL----基础sql练习

练习脚本：

CREATE DATABASE filmclub;

USE filmclub;

CREATE TABLE category
(
cid INT PRIMARY KEY AUTO_INCREMENT,
cname VARCHAR(20)
);
CREATE TABLE film
(
fid INT PRIMARY KEY AUTO_INCREMENT,
fname VARCHAR(20),
director VARCHAR(20), #导演
price DECIMAL(10,2),
showtime DATE,
cid INT,
FOREIGN KEY(cid) REFERENCES category(cid)
);
CREATE TABLE USER
(
uid INT PRIMARY KEY AUTO_INCREMENT,
uname VARCHAR(20),
birthday DATE,
gender ENUM('男','女'),
address VARCHAR(20),
cellphone CHAR(11)
);
CREATE TABLE user_category
(
uid INT,
cid INT,
FOREIGN KEY(uid) REFERENCES USER(uid),
FOREIGN KEY(cid) REFERENCES category(cid),
PRIMARY KEY(uid,cid)
);

CREATE TABLE emp
(
eid INT PRIMARY KEY AUTO_INCREMENT,
ename VARCHAR(20),
gender ENUM('男','女'),
hiredate DATE,
sal DECIMAL(10,2),
address VARCHAR(20)
);

CREATE TABLE sal_grade
(
gid INT PRIMARY KEY AUTO_INCREMENT,
minsal DECIMAL(10,2),
maxsal DECIMAL(10,2)
);

CREATE TABLE orders
(
eid INT,
uid INT,
fid INT,
num INT,
odate DATE
);

INSERT INTO category VALUES(NULL, '喜剧');
INSERT INTO category VALUES(NULL, '动作');
INSERT INTO category VALUES(NULL, '悬疑');
INSERT INTO category VALUES(NULL, '恐怖');
INSERT INTO category VALUES(NULL, '科幻');
INSERT INTO category VALUES(NULL, '战争');
INSERT INTO category VALUES(NULL, '爱情');
INSERT INTO category VALUES(NULL, '灾难');

INSERT INTO film VALUES(NULL, '天下无贼','冯小刚',50,'2008-12-12',1);
INSERT INTO film VALUES(NULL, '功夫','周星驰',150,'2009-12-12',2);
INSERT INTO film VALUES(NULL, '大话西游','周星驰',20,'2012-3-12',3);
INSERT INTO film VALUES(NULL, '我不是潘金莲','冯小刚',30,'2007-5-31',1);
INSERT INTO film VALUES(NULL, '道士下山','陈凯歌',40,'2004-8-9',8);
INSERT INTO film VALUES(NULL, '火锅英雄','陈凯歌',60,'2011-11-11',7);
INSERT INTO film VALUES(NULL, '寻龙诀','冯小刚',100,'2007-7-7',7);
INSERT INTO film VALUES(NULL, '老炮儿','陈凯歌',80,'2005-9-2',1);
INSERT INTO film VALUES(NULL, '我是证人','周星驰',90,'2010-10-5',2);
INSERT INTO film VALUES(NULL, '叶问','冯小刚',120,'2012-6-3',3);

INSERT INTO USER VALUES(NULL,'刘欢','1950-1-1','男','北大街','13312345678');
INSERT INTO USER VALUES(NULL,'张学友','1955-2-3','男','南大街','13312345676');
INSERT INTO USER VALUES(NULL,'刘嘉玲','1970-11-21','女','北大街','13312345675');
INSERT INTO USER VALUES(NULL,'李嘉欣','1988-9-3','女','南大街','13312345673');
INSERT INTO USER VALUES(NULL,'刘德华','1953-2-11','男','北大街','13312345672');
INSERT INTO USER VALUES(NULL,'张国立','1999-12-31','男','东大街','13312345671');
INSERT INTO USER VALUES(NULL,'张国荣','1988-3-23','男','西大街','13312345670');
INSERT INTO USER VALUES(NULL,'刘建国','1970-6-22','男','西大街','13312345679');

INSERT INTO user_category VALUES(1,2);
INSERT INTO user_category VALUES(1,3);
INSERT INTO user_category VALUES(2,8);
INSERT INTO user_category VALUES(3,1);
INSERT INTO user_category VALUES(3,5);
INSERT INTO user_category VALUES(3,7);
INSERT INTO user_category VALUES(2,1);
INSERT INTO user_category VALUES(1,7);
INSERT INTO user_category VALUES(8,8);
INSERT INTO user_category VALUES(8,7);
INSERT INTO user_category VALUES(5,7);
INSERT INTO user_category VALUES(5,3);
INSERT INTO user_category VALUES(2,6);
INSERT INTO user_category VALUES(7,1);
INSERT INTO user_category VALUES(7,2);
INSERT INTO user_category VALUES(7,3);

INSERT INTO emp VALUES(NULL, '郭靖', '男', '2002-2-3',2500,'东大街');
INSERT INTO emp VALUES(NULL, '黄蓉', '女', '2003-12-3',5500,'东大街');
INSERT INTO emp VALUES(NULL, '杨幂', '女', '2002-2-8',8500,'西大街');
INSERT INTO emp VALUES(NULL, '刘诗诗', '女', '2004-4-12',6500,'南大街');

INSERT INTO sal_grade VALUES(NULL, 1000, 2000);
INSERT INTO sal_grade VALUES(NULL, 2001, 4000);
INSERT INTO sal_grade VALUES(NULL, 4001, 5000);
INSERT INTO sal_grade VALUES(NULL, 5001, 7000);
INSERT INTO sal_grade VALUES(NULL, 7001, 9000);

INSERT INTO orders VALUES(1,2,10,1,'2016-11-11');
INSERT INTO orders VALUES(2,3,8,2,'2016-2-21');
INSERT INTO orders VALUES(3,7,10,1,'2016-3-21');
INSERT INTO orders VALUES(1,1,7,1,'2016-10-15');
INSERT INTO orders VALUES(1,8,3,1,'2016-2-17');
INSERT INTO orders VALUES(1,7,1,1,'2016-5-18');
INSERT INTO orders VALUES(4,1,1,1,'2016-5-7');
INSERT INTO orders VALUES(4,2,1,1,'2016-5-9');
INSERT INTO orders VALUES(4,3,1,1,'2016-11-10');
INSERT INTO orders VALUES(3,5,10,1,'2016-5-11');
INSERT INTO orders VALUES(2,1,1,1,'2016-7-12');
INSERT INTO orders VALUES(2,1,1,2,'2016-7-13');
INSERT INTO orders VALUES(2,1,1,3,'2016-7-14');
INSERT INTO orders VALUES(2,1,9,5,'2016-8-19');
INSERT INTO orders VALUES(2,1,8,3,'2016-8-4');
INSERT INTO orders VALUES(2,2,5,1,'2016-8-6');
INSERT INTO orders VALUES(2,2,6,1,'2016-1-22');
INSERT INTO orders VALUES(2,2,1,1,'2016-1-11');
INSERT INTO orders VALUES(2,6,3,1,'2016-2-17');
INSERT INTO orders VALUES(2,6,8,2,'2016-3-12');

SELECT FROM category;
SELECT FROM film;
SELECT FROM USER;
SELECT FROM USER_category;
SELECT FROM emp;
SELECT FROM sal_grade;
SELECT * FROM orders;
习题：

#1查询价格比2号类型所有电影平均价还低的电影
SELECT * FROM film WHERE price <
(SELECT AVG(price) FROM film WHERE cid=2);

SELECT * FROM film;

#2查询张学友喜欢的类型中所有电影的最高价
SELECT MAX(price) FROM film WHERE cid IN
(
SELECT cid FROM user_category WHERE uid =
(
SELECT uid FROM USER WHERE uname = '张学友'
)
);
#3查询所有电影，以及电影对应的类型名，要求显示出所有类型名(mysql没有完全外连接FULL JOIN，只能用联合查询)
SELECT FROM film RIGHT JOIN category ON film.cid = category.cid
UNION
SELECT FROM film LEFT JOIN category ON film.cid = category.cid

#4查询价格大于天下无贼的电影中，每部类型各多少电影
SELECT cid,COUNT(*) FROM film WHERE price >
(SELECT price FROM film WHERE fname = '天下无贼')
GROUP BY cid;

#5查询那些员工给那些会员卖了哪些电影
SELECT ename,uname,fname FROM emp e,USER u,film f,orders o
WHERE e.eid = o.eid AND o.uid = u.uid AND f.fid = o.fid

#6查询有回头客的员工
SELECT eid,uid,COUNT() FROM orders GROUP BY eid,uid HAVING COUNT() > 1;

#7查询回头客超过一个的员工（表子查询在mysql中必须起别名，否则报错，orcale中则不需要别名）
SELECT eid,COUNT() FROM (
SELECT eid,uid,COUNT() FROM orders
GROUP BY eid,uid
HAVING COUNT(*) > 1
)aa
GROUP BY eid

#8查询价格比所有喜剧类型的平均价还高的电影
SELECT * FROM film WHERE price >
(
SELECT AVG(price) FROM film WHERE cid =
(SELECT cid FROM category WHERE cname = '喜剧')
)
#9查询电影所属类型的平均价（相关子查询）
SELECT fname,(SELECT AVG(price) FROM film WHERE cid = a.cid) AS 所属类型平均价 FROM film a

#10查询价格比1号类型所有电影价格都高的电影
SELECT FROM film WHERE price >
(
SELECT MAX(price) FROM film WHERE cid = 1
)
#11查询上映日期比天下无贼晚的电影中，每个导演各多少部电影
SELECT FROM film WHERE showtime >
(SELECT showtime FROM film WHERE fname = '天下无贼')

#12查询哪些用户都喜欢哪些类型
SELECT uname,cname FROM USER,category,user_category
WHERE user.uid = user_category.uid AND category.cid = user_category.cid

#13查询喜欢类型超过2种的用户
SELECT uname FROM
(
SELECT uname,cname FROM USER,category,user_category
WHERE user.uid = user_category.uid AND category.cid = user_category.cid
)aa
GROUP BY uname HAVING COUNT(*) > 2
#14查询从来没有被喜欢过的类型
SELECT cname FROM category WHERE cid NOT IN(
SELECT DISTINCT cid FROM user_category)

#15查询喜欢了所有类型的用户
SELECT uid,COUNT() FROM user_category GROUP BY uid
HAVING COUNT() = (
SELECT COUNT(*) FROM category
)

#16查询每个销售人员的销售总额
SELECT ename,SUM(num*price) FROM emp,film,orders WHERE
emp.eid = orders.eid AND
orders.fid = film.fid
GROUP BY ename

#17查询每个电影各被卖出多少张
SELECT fname,SUM(num) FROM film JOIN orders
ON film.fid = orders.fid
GROUP BY fname

#18查询上映日期比周星驰导演所有电影都晚的电影中，每种类型电影的最低价
SELECT (SELECT cname FROM category WHERE a.cid = cid),MIN(price) FROM film a WHERE showtime >
(SELECT MAX(showtime) FROM film WHERE director = '周星驰')
GROUP BY cid

#19查询在闰年上映的电影
SELECT * FROM film WHERE YEAR(showtime) % 4 = 0 AND YEAR(showtime) % 100 != 0
OR YEAR(showtime) % 400 = 0

#20查询上映日期中，月份比日期大的电影
SELECT * FROM film WHERE MONTH(showtime) > DAY(showtime)

#21查询价格与类型都与‘天下无贼’相同的电影
SELECT * FROM film
WHERE (cid,price) =
(SELECT cid,price FROM film WHERE fname = '天下无贼')

#22查询最受欢迎的类型
SELECT cid,COUNT() FROM user_category
GROUP BY cid
HAVING COUNT() >= ALL
(SELECT COUNT(*) FROM user_category
GROUP BY cid)

#23查询每个用户各花了多少钱
SELECT uid,SUM(num*price) FROM orders,film
WHERE orders.fid = film.fid
GROUP BY uid

MySQL----基础sql练习

猜你喜欢