創建QQ數據庫

#創建數據庫
CREATE     DATABASE QQ
#創建表名 並且添加列
DROP TABLE IF EXISTS `dbo.BaseInfo`;
CREATE TABLE `student`(
QQID INT PRIMARY KEY AUTO_INCREMENT,
NickName VARCHAR(32),
Sex INT,
Age INT ,
Province VARCHAR(256),
City VARCHAR(32),
Address VARCHAR(32),
Phone INT
)
#修改表名
ALTER TABLE student RENAME BaseInfo
#添加BaseInfo表qq表的信息數據
INSERT INTO student (QQID,NickName,Sex,Age,Province,City,Address,Phone)VALUES 
(
 
8855678,‘獨行俠‘,1,38,‘北京‘,‘海澱區‘,‘上地‘,003),
(54789625,‘蝴蝶飛飛‘,1,16,‘北京‘,‘朝陽區‘,‘亞運村‘,001),
(88662753,‘青青草‘,0,20,‘河南省‘,‘安陽‘,‘湯陰‘,002);

#創建QQUser表並且添加列
CREATE TABLE `QQUser`(
QQID INT PRIMARY KEY AUTO_INCREMENT,
PASSWORD VARCHAR(32),
LastLogTime DATETIME,
OnLine INT ,
LEVEL INT
)
#添加QQUser表的信息數據
INSERT INTO QQUser (QQID,PASSWORD,LastLogTime,OnLine,LEVEL)VALUES 
(
 
8855678,‘guest0221‘,‘2008-02-21 16:28:20:000‘,1,6),
(54789625,‘add521#&‘,‘2008-02-16 17:01:35:000‘,2,1),
(88662753,‘admin0219‘,‘2008-02-19 21:08:35:000‘,0,5);

#刪除表名
 DROP TABLE QQUser
#創建QQUser表並且添加列
CREATE TABLE `Relation`(
QQID INT ,
RelationQQID INT,
RelationStalus INT
)
#添加QQUser表的信息數據
INSERT INTO Relation (QQID,RelationQQID,RelationStalus)VALUES 
(
 
54789625,88662753,0),
(88662753,8855678,1),
(54789625,8855678,0);

01.查詢QQ號碼為54789625的所有好友信息，包括QQ號碼，昵稱,年齡
SELECT QQID,NickName,Age FROM baseinfo WHERE QQID =54789625

#02.查詢當前在線用戶的信息
SELECT *FROM qquser WHERE OnLine!=0

#03.查詢北京的、年齡在18至45歲之間的在線用戶的信息
SELECT *FROM baseinfo,qquser 
WHERE baseinfo.QQID =qquser.QQID AND baseinfo.Province=‘北京‘ AND baseinfo.Age BETWEEN 18 AND 45 AND qquser.OnLine>0

#04.查詢昵稱為青青草的用戶信息
SELECT *FROM baseinfo WHERE NickName=‘青青草‘

#05.查詢QQ號碼為54789625的用戶的好友中每個省份的總人數，並且總人數按由大到小排序。
SELECT COUNT(Province) FROM baseinfo WHERE QQID IN (
SELECT QQID FROM relation WHERE RelationQQID
IN(
SELECT RelationQQID FROM relation WHERE QQID =‘54789625‘ )
)
GROUP BY Province

#06.查詢至少有150天未登錄QQ賬號的用戶信息，包括QQ號碼，最後一次登錄時間、等級、昵稱、年齡，並按時間的降序排列
SELECT qquser.QQID, LastLogTime,LEVEL,NickName,Age FROM baseinfo,qquser WHERE baseinfo.QQID=qquser.QQID AND baseinfo.QQID IN(
SELECT QQID FROM qquser WHERE DATEDIFF(NOW(),LastLogTime ) >=150 
)
GROUP BY LastLogTime

 
#07.查詢QQ號碼為54789625的好友中等級為10級以上的“月亮”級用戶信息。
SELECT *FROM baseinfo WHERE QQID IN(SELECT QQID FROM qquser WHERE LEVEL>10 AND QQID IN(
SELECT QQID FROM relation WHERE RelationQQID IN (
SELECT RelationQQID FROM relation WHERE QQID =‘54789625‘
))) 

#08.--查詢QQ號碼為54789625的好友中隱身的用戶信息。
SELECT *FROM baseinfo WHERE QQID IN (SELECT QQID FROM qquser WHERE OnLine=0 AND QQID IN (
SELECT QQID FROM relation WHERE RelationQQID IN (
SELECT RelationQQID FROM relation WHERE QQID =‘54789625‘
)))

#09.--查詢好友超過20個的用戶信息。
SELECT *FROM baseinfo WHERE QQID IN (
SELECT QQID FROM relation WHERE RelationQQID IN(
SELECT RelationQQID FROM relation GROUP BY QQID HAVING COUNT(RelationQQID)>20)
)

#10.為了查看信譽度，管理員需要查詢被當做黑名單人物次數排名前3的用戶
SELECT * FROM  baseinfo WHERE baseinfo.QQID IN(
    SELECT qquser.QQID FROM qquser WHERE baseinfo.QQID=qquser.QQID AND qquser.QQID IN(
    SELECT relation.QQID FROM relation WHERE relation.RelationStalus=1
)
ORDER BY qquser.Level DESC
)
         LIMIT 3

##用例2：修改數據
#01.假設我的QQ號碼為8855678，今天我隱身登錄
UPDATE qquser SET  OnLine=‘0‘ WHERE QQID =‘8855678‘

#02.假設我的QQ號碼為8855678，修改我的昵稱為“被淹死的魚”，地址為“解放中路號院123室”
UPDATE baseinfo SET NickName=‘被淹死的魚‘,Address =‘解放中路號院123室‘ WHERE QQID=‘8855678‘

#03.假設我的QQ號碼為54789625，將我的好友“青青草”拖進黑名單。
UPDATE relation SET RelationStalus =1 WHERE QQID =‘54789625‘

#04.為了提高QQ用戶的聊天積極性，把等級小於6級的用戶的等級都提升1個級別。
UPDATE qquser SET LEVEL =LEVEL+1 WHERE LEVEL<6

#05.管理員將超過365天沒有登錄過的QQ鎖定（即將等級值設定為-1）。
UPDATE qquser SET LEVEL =-1 WHERE DATEDIFF(NOW(),LastLogTime ) >=365 

#06.為了獎勵用戶，將好友數量超過20的用戶等級提升1個級別。
UPDATE qquser SET LEVEL=LEVEL+1  WHERE (
SELECT RelationQQID FROM relation GROUP BY QQID HAVING COUNT(RelationQQID)>20)


#07.把QQ號碼為54789625的用戶的好友“嘟嘟魚”拖進黑名單中。
UPDATE  relation SET RelationStalus =1 WHERE QQID =‘54789625‘


##用例3：刪除數據
#1.把QQ號碼為54789625的用戶黑名單中的用戶刪除。
DELETE  FROM relation WHERE QQID=‘54789625‘

#2.QQ號碼為54789625的用戶多次在QQ中發布違法信息，造成了很壞的影響，因此管理員決定將其刪除。
DELETE FROM baseinfo WHERE QQID =‘54789625‘

#3.管理員將超過1000天沒有登錄過的QQ刪除。
UPDATE  FROM qquser WHERE DATEDIFF(NOW(),LastLogTime ) >=1000 

數據庫編程測試機試 QQ