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使用Mysql实现QQ数据库管理

时间:2021-07-01 10:21:17 帮助过:30人阅读

第一步

 建立一个数据库

  CREATE DATABASE 数据库名称

第二步

 建表

 CREATE TABLE  QQUser

  (

     QQID INT PRIMARY KEY NOT NULL,

     PASSWORD VARCHAR(50) NOT NULL,

     lastLoginTime DATETIME NOT NULL,

     online INT NOT NULL,

     levle INT NOT NULL

  )

  CREATE TABLE BaseInfo(

    QQID INT(20) NOT NULL PRIMARY KEY,

    NicName VARCHAR(20)NOT NULL ,

    Sex CHAR(20), 

    Age INT(150),

    Province VARCHAR(50),

    City VARCHAR(50),

    Adress VARCHAR(200),

    Phone CHAR(50)
   );

  CREATE TABLE Relation(
    QQID INT(20) NOT NULL,

    RelationQQID INT(50) NOT NULL ,

    RelationStayus INT (20)
  );

PS(省略添加数据的过程)

第四步:建立外键约束

 语法: ALTER TABLE 表名 ADD CONSTRAINT  外键名 FOREIGN KEY  (外键字段) REFERENCES 关联表名 (关联字段);

 ALTER TABLE `relation` ADD CONSTRAINT fk_baseinfo_relation_QQid FOREIGN KEY (`QQid`) REFERENCES `baseinfo`(`QQID`);

 ALTER TABLE `relation` ADD CONSTRAINT fk_baseinfo_relation_RetionQQid FOREIGN KEY (`RetionQQid`) REFERENCES `baseinfo`(`QQID`);

 ALTER TABLE `baseinfo` ADD CONSTRAINT fk_qquser_baseinfo_QQid FOREIGN KEY (`QQID`) REFERENCES `qquser`(`QQid`);

 

#01.查询QQ号码为54789625的所有好友信息,包括QQ号码,昵称,年龄

select RelationQQID as QQ号码,NickName as 昵称,Age as 年龄

from BaseInfo,Relation

where BaseInfo.QQID=Relation.RelationQQID

and Relation.QQID=54789625

and RelationStatus=0 或者1

#02.查询当前在线用户的信息(3分)

SELECT NickName,Province FROM

BaseInfo,QQUser

WHERE BaseInfo.QQID=QQUser.QQID AND Online=0

#03.查询北京的、年龄在18至45岁之间的在线用户的信息

SELECT NickName,Province FROM

BaseInfo,QQUser

WHERE BaseInfo.QQID=QQUser.QQID

AND   BaseInfo.Province LIKE ‘%北京%‘

AND   BaseInfo.Age BETWEEN 18 AND 45

AND   Online=0

#04.查询昵称为青青草的用户信息

SELECT NickName,Province,City,Address

FROM BaseInfo

WHERE NickName=‘青青草‘

#05.查询QQ号码为54789625的用户的好友中每个省份的总人数,并且总人数按由大到小排序。

SELECT BaseInfo.Province,COUNT(*) AS 总人数 FROM Relation,BaseInfo

WHERE Relation.RelationQQID=BaseInfo.QQID

AND Relation.RelationStatus=0

AND Relation.QQID=54789625

GROUP BY BaseInfo.Province

ORDER BY 总人数 DESC

#06.查询至少有150天未登录QQ账号的用户信息,包括QQ号码,最后一次登录时间、等级、昵称、年龄,并按时间的降序排列

SELECT QQUser.QQID,QQUser.LastLogTime,QQUser.Level,BaseInfo.NickName,BaseInfo.Age

FROM BaseInfo,QQUser

WHERE BaseInfo.QQID=QQUser.QQID

AND DATEDIFF(NOW(),lastLogTime)>=150

ORDER BY DATEDIFF(NOW(),lastLogTime) DESC

#07.查询QQ号码为54789625的好友中等级为10级以上的“月亮”级用户信息。

SELECT NickName,Province

FROM QQUser,Relation,BaseInfo

WHERE Relation.RelationQQID=BaseInfo.QQID

AND Relation.QQID=54789625

AND Relation.RelationStatus=0

AND Relation.RelationQQID=QQUser.QQID

AND QQUser.Level>=10

#08.--查询QQ号码为54789625的好友中隐身的用户信息。

SELECT NickName,province

FROM Relation INNER JOIN BaseInfo

ON Relation.RelationQQID=BaseInfo.QQID

AND Relation.QQID=54789625

INNER JOIN QQUser

ON QQUser.QQID=RelationQQID

AND Online=2  #2代表隐身

AND Relation.RelationStatus=0  #0代表好友

#09.--查询好友超过20个的用户信息。

SELECT Nickname,province

FROM BaseInfo WHERE QQID IN

(SELECT QQID

FROM Relation

WHERE RelationStatus=0

GROUP BY QQID

HAVING COUNT(*)>20

)

#10.为了查看信誉度,管理员需要查询被当做黑名单人物次数排名前3的用户

SELECT  RelationQQID,COUNT(*) AS 次数

FROM Relation

WHERE RelationStatus=1

GROUP BY RelationQQID

ORDER BY COUNT(*) DESC

LIMIT 3

#01.假设我的QQ号码为8855678,今天我隐身登录

UPDATE QQUser SET Online=2,LastLogTime=NOW()

WHERE QQID=8855678

#02.假设我的QQ号码为8855678,修改我的昵称为“被淹死的鱼”,地址为“解放中路号院123室”

UPDATE BaseInfo SET NickName=‘被淹死的鱼‘,Address=‘解放中路号院室‘

WHERE  QQID=8855678

#03.假设我的QQ号码为54789625,将我的好友“青青草”拖进黑名单。

UPDATE Relation SET RelationStatus=1

WHERE QQID=54789625 AND RelationQQID=88662753

#04.为了提高QQ用户的聊天积极性,把等级小于6级的用户的等级都提升1个级别。

update QQUser set Level=Level+1

where Level<6

#05.管理员将超过365天没有登录过的QQ锁定(即将等级值设定为-1)。

UPDATE QQUser SET LEVEL=-1

WHERE DATEDIFF(NOW(),lastLogTime)>=365

#06.为了奖励用户,将好友数量超过20的用户等级提升1个级别。

UPDATE QQUser SET LEVEL=LEVEL+1

WHERE QQID IN(

SELECT Relation.QQID FROM Relation

WHERE RelationStatus=0

GROUP BY Relation.QQID

HAVING COUNT(Relation.RelationQQID)>=20)

#07.把QQ号码为54789625的用户的好友“嘟嘟鱼”拖进黑名单中。

UPDATE Relation SET RelationStatus=1

WHERE QQID=54789625 AND RelationQQID=

(SELECT QQID FROM BaseInfo WHERE NickName=‘嘟嘟鱼‘)

AND RelationStatus=0

 

#1.把QQ号码为54789625的用户黑名单中的用户删除。

DELETE FROM Relation WHERE QQID=54789625 AND RelationStatus=1

#2.QQ号码为54789625的用户多次在QQ中发布违法信息,造成了很坏的影响,因此管理员决定将其删除。

DELETE FROM Relation WHERE QQID=54789625 OR RelationQQID=54789625

DELETE FROM BaseInfo WHERE QQID=54789625

DELETE FROM QQUser WHERE QQID=54789625

#3.管理员将超过1000天没有登录过的QQ删除。

DELETE FROM Relation WHERE QQID IN

(

  SELECT QQID FROM QQUser

  WHERE DATEDIFF(NOW(),LastLogTime)>=1000

)

OR RelationQQID IN

(

  SELECT QQID FROM QQUser

  WHERE DATEDIFF(NOW(),LastLogTime)>=1000

)

DELETE FROM BaseInfo WHERE QQID IN

(

  SELECT QQID FROM QQUser

  WHERE DATEDIFF(NOW(),LastLogTime)>=1000

)

DELETE FROM                             

WHERE DATEDIFF(NOW(),LastLogTime)>=1000

 

使用Mysql实现QQ数据库管理

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