MySQL[练习|面试题]-我的租房网

 1 # 创建数据库

 2 CREATE DATABASE Tenement;

 3

 4 # 切换数据库

 5 USE Tenement;

 6 # 创建客户信息表 sys_user

 7 CREATE TABLE sys_user(

 8   uid INT PRIMARY KEY AUTO_INCREMENT,

 9   uName VARCHAR(20) NOT NULL,

10   uPassWord VARCHAR(20)

11 );

12 DESC sys_user;

13

14 # 创建区县信息表

15 CREATE TABLE IF NOT EXISTS hos_district(

16   did INT PRIMARY KEY AUTO_INCREMENT,

17   dName VARCHAR(50) NOT NULL

18 );

19 DESC hos_district;

20

21 # 创建街道信息表

22 CREATE TABLE IF NOT EXISTS hos_street(

23   sid INT PRIMARY KEY AUTO_INCREMENT,

24   sName VARCHAR(50) NOT NULL,

25   sDid INT NOT NULL

26 );

27 DESC hos_street;

28 # 为sDid 字段添加外键

29 ALTER TABLE hos_street ADD CONSTRAINT

30 FOREIGN KEY(sDid)

31 REFERENCES hos_district(did);

32

33 # -----创建房屋类型表------

34 CREATE TABLE IF NOT EXISTS hos_type(

35   hTid INT PRIMARY KEY AUTO_INCREMENT,

36   htName VARCHAR(20) NOT NULL

37 );

38 DESC hos_type;

39

40 # ------创建出租房信息表--------

41 CREATE TABLE IF NOT EXISTS hos_house(

42   hMid INT PRIMARY KEY AUTO_INCREMENT,

43   uid INT NOT NULL,

44   sid INT NOT NULL,

45   hTid INT NOT NULL,

46   price DECIMAL DEFAULT 0 NOT NULL,

47   topic VARCHAR(50) NOT NULL,

48   contents VARCHAR(255) NOT NULL

49 );

50 ALTER TABLE hos_house ADD hTime DATETIME ;

51 ALTER TABLE hos_house ADD copy VARCHAR(50);

52

53 DESC hos_house;

54 # 为hos_house表添加主外键

55 ALTER TABLE hos_house ADD CONSTRAINT

56 FOREIGN KEY (uid)

57 REFERENCES sys_user(uid);

58

59 ALTER TABLE hos_house ADD CONSTRAINT

60 FOREIGN KEY(sid)

61 REFERENCES hos_street(sid);

62

63 ALTER TABLE hos_house ADD CONSTRAINT

64 FOREIGN KEY(hTid)

65 REFERENCES hos_type(hTid);

建库建表

 1  /*

 2  *客户信息表

 3  */

 4

 5 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('张三','s217701');

 6 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('李四','s217702');

 7 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('王鑫','s217703');

 8 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('张建','s217704');

 9 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('李剑','s217705');

10 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('蒋以然','s217706');

11 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('王晓超','s217707');

12 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('张冬雪','s217708');

13 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('孙鹏','s217709');

14 INSERT INTO sys_user(UNAME,UPASSWORD) VALUES('蒋连昌','s217710');

15 /*

16 *区县信息

17 */

18

19 INSERT INTO hos_district (DNAME) VALUES('海淀区');

20 INSERT INTO hos_district (DNAME) VALUES('西城区');

21 INSERT INTO hos_district (DNAME) VALUES('东城区');

22 INSERT INTO hos_district (DNAME) VALUES('朝阳区');

23 INSERT INTO hos_district (DNAME) VALUES('景山区');

24 INSERT INTO hos_district (DNAME) VALUES('宣武区');

25 INSERT INTO hos_district (DNAME) VALUES('大兴');

26 INSERT INTO hos_district (DNAME) VALUES('丰台');

27 /*

28 *街道信息表

29 */

30

31 INSERT INTO hos_street (SNAME,SDID) VALUES('中关村',1);

32 INSERT INTO hos_street (SNAME,SDID) VALUES('苏州街',1);

33 INSERT INTO hos_street (SNAME,SDID) VALUES('万泉庄',1);

34 INSERT INTO hos_street (SNAME,SDID) VALUES('东四',3);

35 INSERT INTO hos_street (SNAME,SDID) VALUES('东单',3);

36 INSERT INTO hos_street (SNAME,SDID) VALUES('西四',2);

37 INSERT INTO hos_street (SNAME,SDID) VALUES('西单',2);

38 INSERT INTO hos_street (SNAME,SDID) VALUES('东湖',4);

39 INSERT INTO hos_street (SNAME,SDID) VALUES('八里庄',4);

40 INSERT INTO hos_street (SNAME,SDID) VALUES('双井',5);

41 INSERT INTO hos_street (SNAME,SDID) VALUES('陶然亭',5);

42 INSERT INTO hos_street (SNAME,SDID) VALUES('南菜园',6);

43 INSERT INTO hos_street (SNAME,SDID) VALUES('兴丰街',7);

44 INSERT INTO hos_street (SNAME,SDID) VALUES('黄村',7);

45 INSERT INTO hos_street (SNAME,SDID) VALUES('南苑街',8);

46 INSERT INTO hos_street (SNAME,SDID) VALUES('东铁营',8);

47 /*

48 *房屋类型表

49 */

50

51 INSERT INTO hos_type (HTNAME) VALUES('一室一卫');

52 INSERT INTO hos_type (HTNAME) VALUES('一室一厅');

53 INSERT INTO hos_type (HTNAME) VALUES('两室一卫');

54 INSERT INTO hos_type (HTNAME) VALUES('两室一厅');

55 INSERT INTO hos_type (HTNAME) VALUES('三室一厅');

56 INSERT INTO hos_type (HTNAME) VALUES('三室两厅');

57 /*

58 *出租房屋信息表

59 */

60

61 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

62 VALUES(1,1,2,2600,'中关村','中关村一条街','2009-1-2','中关村');

63 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

64 VALUES(2,2,3,3600,'苏州街','苏州街一条街','2009-1-3','苏州街');

65 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

66 VALUES(3,3,4,4600,'万泉庄','万泉庄一条街','2009-1-4','万泉庄');

67 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

68 VALUES(1,3,2,1500,'万泉庄附近','万泉庄附近一条街','2009-7-2','万泉庄附近');

69 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

70 VALUES(1,5,2,2700,'东单','东单很多美食','2009-9-2','东单');

71 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

72 VALUES(3,1,2,2600,'中关村','中关村电脑城','2009-4-1','中关村');

73 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

74 VALUES(4,4,1,2000,'东四','东四一条街','2009-4-2','东四');

75 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

76 VALUES(5,6,3,3600,'西四','西四一条街','2009-1-2','西四');

77 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

78 VALUES(5,7,2,3600,'西单','西单购物城','2009-4-2','西单');

79 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

80 VALUES(6,2,2,2600,'苏州街','苏州街美食','2009-2-2','苏州街');

81 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

82 VALUES(7,8,3,2900,'朝阳东湖','朝阳东湖一景','2009-3-2','朝阳');

83 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

84 VALUES(8,3,1,700,'万泉庄','万泉庄一条街','2009-5-2','万泉庄');

85 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

86 VALUES(3,2,3,4200,'苏州街','苏州街二条街','2009-1-3','苏州街');

87 INSERT INTO hos_house(UID,SID,HTID,PRICE,TOPIC,CONTENTS,HTIME,COPY)

88 VALUES(4,2,3,4100,'苏州街','苏州街西街','2009-1-3','苏州街');

插入数据

 1 # 上机4 分页显示查询出租房屋信息 并用 临时表存放

 2 CREATE TABLE hos_houseTemp

 3 SELECT * FROM hos_house

 4 LIMIT 5,5;

 5

 6 SELECT * FROM hos_houseTemp;

 7

 8

 9

10 # 上机5 查询张三所发布的房屋信息,显示房屋分布的街道和区县

11 SELECT d.`dName` AS 区县,s.`sName` AS 街道,h.htid AS 户型,

12 h.`price` AS 价格,h.`topic` AS 标题,h.`contents` AS 内容,h.`hTime` AS 时间,h.copy AS 备注

13 FROM hos_house h

14 INNER JOIN hos_street s ON s.`sid`=h.`sid`

15 INNER JOIN hos_district d ON d.`did`=s.`sDid`

16 WHERE h.uid = (

17   SELECT uid

18   FROM sys_user WHERE uName='张三'

19 );

20

21 # 另一种做法

22 SELECT *

23 FROM hos_house WHERE uid = (

24   SELECT uid FROM sys_user

25   WHERE uname='张三'

26 )

27 # 子查询前置 生成一个查询结果表 然后再进行多表查询

28 # 这样优化查询速度

29

30 SELECT d.`dName` AS 区县,s.`sName` AS 街道,h.htid AS 户型,

31      h.`price` AS 价格,h.`topic` AS 标题,h.`contents` AS 内容,h.`hTime` AS 时间,h.copy AS 备注

32 FROM (

33   SELECT *

34   FROM hos_house WHERE uid = (

35     SELECT uid FROM sys_user

36     WHERE uname='张三'

37   )

38 ) AS h INNER JOIN hos_street s ON h.sid = s.sid

39 INNER JOIN hos_district d ON s.sdid = d.did

40

41

42 # 上机6 根据户型和房屋所在区县和街道,为至少有两个街道有出租房屋的区县制作出租房屋清单

43 SELECT t.htName AS 户型,u.uName AS 姓名,d.dName AS 区县,s.sName AS 街道名

44 FROM hos_house h

45 INNER JOIN hos_type t ON h.hTid=t.hTid

46 INNER JOIN sys_user u ON h.uid = u.uid

47 INNER JOIN hos_street s ON h.sid=s.sid

48 INNER JOIN hos_district d ON s.sDid = d.did

49 WHERE d.did IN (

50   SELECT d.did

51   FROM hos_house h  INNER JOIN hos_street s ON h.sid=s.sid

52   INNER JOIN hos_district d ON s.sDid = d.did

53   GROUP BY d.did

54   HAVING COUNT(DISTINCT s.sid)>1

55 )

56 ORDER BY d.dName

57

58

59 # 上机7 房屋出租统计合并

60 SELECT 1 AS 季度,'合计' AS 区县,' ' AS 街道 ,' ' AS 户型,COUNT(*) AS 房屋数量

61 FROM hos_house h

62 WHERE MONTH(htime)>=1 AND MONTH(htime)<=3

63 UNION

64 SELECT 1 AS 季度,d.dName AS 区县,' ' AS 街道 ,' ' AS 户型,COUNT(*) AS 房屋数量

65 FROM hos_house h INNER JOIN hos_street s ON h.sid=s.sid

66 INNER JOIN hos_district d ON s.sdid=d.did

67 WHERE MONTH(htime)>=1 AND MONTH(htime)<=3

68 GROUP BY d.did

69 UNION

70 SELECT 1 AS 季度,d.dName AS 区县,s.sname AS 街道 ,t.htName AS 户型,COUNT(*) AS 房屋数量

71 FROM hos_house h INNER JOIN hos_street s ON h.sid=s.sid

72 INNER JOIN hos_district d ON s.sdid=d.did

73 INNER JOIN hos_type t ON h.htid=t.htid

74 WHERE MONTH(htime)>=1 AND MONTH(htime)<=3

75 GROUP BY d.did,s.sid,t.htid

76

77 #优化 不能一个季度一个季度的合并

78 # 直接使用QUARTER()季度函数

79 SELECT QUARTER(htime) AS 季度,'合计' AS 区县,' ' AS 街道 ,' ' AS 户型, COUNT(*) AS 房屋数量

80 FROM hos_house

81 GROUP BY QUARTER(htime)

82 UNION

83 SELECT QUARTER(htime) AS 季度,d.dName AS 区县,' ' AS 街道 ,' ' AS 户型, COUNT(*) AS 房屋数量

84 FROM hos_house h,hos_street s,hos_district d

85 WHERE h.sid =s.sid AND s.sdid=d.did

86 GROUP BY QUARTER(htime),d.dname

87 UNION

88 SELECT QUARTER(htime) AS 季度,d.dName AS 区县,s.sname AS 街道 ,t.htName AS 户型, COUNT(*) AS 房屋数量

89 FROM hos_house h,hos_street s,hos_district d,hos_type t

90 WHERE h.sid =s.sid AND s.sdid=d.did AND h.htid = t.htid

91 GROUP BY QUARTER(htime),d.dname,s.sname

92 ORDER BY 季度,区县,街道

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