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QQ数据库管理
--用户表
INSERT dbo.QQUser(QQID,PassWord,LastLogTime,Online,Level)
SELECT '54789625','add512#&','2013-02-16 17:01:35','2','1' UNION
SELECT '88662753','admin0219','2013-02-19 21:08:50','0','5'UNION
SELECT '8855678','guest0221','2013-02-21 16:28:20','1','6'
SELECT *from dbo.QQUser
--基本信息表
INSERT dbo.Baselnfo(QQID,NickName,Sex,Age,Province,City,Address,Phone)
SELECT '54789625','蝴蝶飞飞','1','16','北京市','北京','亚运村','37547388157668'UNION
SELECT '88662753','秋芙蓉','0','20','河南省','南阳','方成博望','88715783657725'UNION
SELECT '8855678','双眼皮の猪','1','38','北京市','北京','双榆树东里','65794968876143'
SELECT *from dbo.Baselnfo
--关系表
INSERT dbo.Relation(QQID,RelationQQID,RelationStatus)
SELECT '54789625','88662753','0'UNION
SELECT '88662753','8855678','1'UNION
SELECT '54789625','8855678','0'
SELECT *from dbo.Relation
--用例6:查询数据
--查询当前在线用户的信息
SELECT *
FROM dbo.QQUser
WHERE Online=0
--查询北京市，年龄在18~45岁的在线用户的信息
SELECT *
FROM dbo.Baselnfo
WHERE Province='北京市' AND Age >=18 OR Age <=45
--查询秋芙蓉
SELECT *
FROM dbo.Baselnfo
WHERE NickName='秋芙蓉'
--查询QQ号码为54789625的用户的好友中每个省份的总人数，并且按总人数由大到小排序
SELECT *
FROM dbo.Relation,dbo.Baselnfo
WHERE (Relation.QQID=54789625 AND Relation.RelationStatus=0 AND Relation.RelationQQID=Baselnfo.QQID)
--查询至少有150天未登录QQ账号的用户信息
SELECT q.QQID,LastLogTime,Level,NickName,Age
FROM QQUser q,Baselnfo b
WHERE q.QQID=b.QQID and DATEDIFF(dd,LastLogTime,GETDATE())>150
ORDER BY LastLogTime DESC
--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 *
FROM dbo.QQUser
WHERE QQID='54789625' AND Level <=10
--查询QQ号码为54789625的好友中隐身的用户信息
SELECT *
FROM dbo.QQUser
WHERE QQID='54789625' AND Online=2
--查询好友超过20个的用户QQ号码及其好友总数
SELECT QQID ,COUNT(*)
FROM dbo.Baselnfo
GROUP BY QQID
HAVING COUNT(*)>=20
--为了分组查询信誉度，管理员需要查询被当作黑名单人物次数排名前20的用户
SELECT TOP 20 QQID
FROM dbo.Relation
WHERE RelationStatus=1
--用例7:修改数据
--假设我的QQ和密码为8855678，今天我隐身登录
UPDATE dbo.QQUser set Online=2
WHERE QQID=8855678
SELECT*FROM dbo.QQUser
--假设我的QQ号码为8855678，修改我的昵称为“被淹死的鱼”，地址为“解放路6号院106室”
UPDATE dbo.Baselnfo
SET NickName='被淹死的鱼',Address='解放路6号院106室'
WHERE QQID=8855678
SELECT * FROM dbo.Baselnfo
--假设我的QQ号码为8855678，将我的好友“248624066”拖进黑名单
UPDATE dbo.Relation
SET RelationQQID=8855678,RelationStatus=1
WHERE QQID=54789625
SELECT * FROM dbo.Relation
--为了提高QQ用户的聊天积极性，把等级小于6级的用户等级都提升1个级别
UPDATE dbo.QQUser
SET Level=(Level+1)
WHERE Level<6
SELECT * FROM dbo.QQUser
--管理员将超过365天没有登录过的QQ锁定（将等级值设定为 -1）
UPDATE dbo.QQUser
SET Level=-1
WHERE DATEDIFF (DD,LastLogTime,GETDATE())>365 AND Online=1
SELECT * FROM dbo.QQUser
--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 dbo.QQUser SET Level =(Level+1)
WHERE QQID IN (SELECT QQID FROM dbo.Relation
WHERE RelationStatus=0
GROUP BY QQID
HAVING COUNT (RelationQQID)>20)
--把QQ号码为286314的用户的好友“嘟嘟鱼”拖进黑名单中
UPDATE dbo.Relation SET RelationQQID=8855678,RelationStatus=0
WHERE QQID=54789625
UPDATE dbo.Relation SET RelationStatus=1
WHERE QQID IN (SELECT QQID FROM dbo.Baselnfo WHERE NickName ='蝴蝶飞飞')
--用例八 ：删除数据
--把QQ号码为54789625的用户的黑名单中的用户删除
DELETE dbo.Relation
WHERE QQID =54789625 AND RelationStatus=1
--QQ号码为622009019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
--在关系表中删除用户622013019的信息
DELETE FROM dbo.Relation
WHERE QQID =622009019 OR RelationQQID=622013019
--在基本信息表中删除用户622013019的信息
DELETE FROM dbo.Baselnfo
WHERE QQID =622013019
--在用户表中删除用户622013019的信息
DELETE FROM dbo.QQUser
WHERE QQID =622013019
--管理员将超过1000天没有登录过的QQ删除
--查询超过1000天没有登录过的QQID
SELECT QQID
FROM dbo.QQUser
WHERE DATEDIFF (DAY ,LastLogTime,GETDATE ())>=1000
--删除dbo.Relation表中的数据
DELETE FROM dbo.Relation
WHERE QQID IN (SELECT QQID FROM dbo.QQUser WHERE DATEDIFF (DAY ,LastLogTime ,GETDATE ())>=1000)
OR RelationQQID IN (SELECT QQID FROM dbo.QQUser WHERE DATEDIFF (DAY ,LastLogTime,GETDATE ())>=1000)
--删除dbo.Baselnfo表中的数据
DELETE FROM dbo.Baselnfo
WHERE QQID IN (SELECT QQID FROM dbo.QQUser WHERE DATEDIFF (DAY ,LastLogTime,GETDATE ())>=1000)
--删除dbo.QQUser表中的数据
DELETE FROM dbo.QQUser
WHERE DATEDIFF(DAY,LastLogTime,GETDATE ())>=1000