13章 练习

--查询数据
   --1
   select RelationQQID as 好友QQ,NickName as 昵称,Age as 年龄
   from [QQ].[dbo].[Relation] as a,[QQ].[dbo].[BaseInfo] as b
   where a.QQID=88662753 and RelationStatus=1
  
   --2 查询当前在线用户信息
 select b. QQID, NickName, Sex, Age, Province, City, Address, Phone
 from [QQ].[dbo].[QQUser] a,[QQ].[dbo].[BaseInfo] b
 where Online=0 and a.QQID=b.QQID
 
   --3 查询北京市,年龄在18-45岁间的在线用户信息
   ------select b.QQID, NickName, Sex, Age, Province, City, Address, Phone
   ------from [QQ].[dbo].[BaseInfo] b,[QQ].[dbo].[QQUser] a
   ------where Province='北京市' and Age>18 or Age<45   and Online=0  AND B.QQID=A.QQID
   
   --4 查询昵称为'飞快的火车 '的用户信息
    select*
    from [QQ].[dbo].[BaseInfo]
    where NickName='飞快的火车 '
    
    
   --5 查询QQ号码为54789625的用户的好友中每个省份的总人数,且按总人数由大到小排序
   SELECT Province,COUNT(*)AS 好友人数
   FROM [QQ].[dbo].[BaseInfo] B,[QQ].[dbo].[Relation] A
   WHERE A.QQID=54789625 AND RelationStatus=0 and a.RelationQQID=b.QQID
   GROUP BY Province
   ORDER BY COUNT(*) DESC
   
   --6 查询至少150天未登陆QQ账号的用户信息,包括QQ号码,最后一次登陆时间,等级,昵称,年龄,并按时间的降序排列
   SELECT B.QQID,Q.LastLogTime,Q.Level,B.NickName,B.Age
   FROM [QQ].[dbo].[BaseInfo] B,[QQ].[dbo].[QQUser] Q
   WHERE B.QQID=Q.QQID AND DATEDIFF(DD,Q.LastLogTime, GETDATE())>150
   ORDER BY   Q.LastLogTime  DESC

   --7查询QQ54789625中的好友等级为10级以上的用户信息
   SELECT R.QQID,B.NickName,B.Age,a.Level
   FROM [QQ].[dbo].[QQUser] a,[QQ].[dbo].[BaseInfo] B,[QQ].[dbo].[Relation] R
   WHERE Level>10 and R.QQID=54789625 and RelationStatus=0 and a.QQID=B.QQID  
   --8 查询QQ54789625中所有隐身好友的信息
   
   ----SELECT R.RelationQQID ,B.NickName, B.Age
   ----FROM [QQ].[dbo].[Relation] R,[QQ].[dbo].[BaseInfo] B ,[QQ].[dbo].[QQUser] Q
   ----WHERE  Q.QQID=54789625 AND Online=2 and RelationStatus=0
 
   --9 查询好友超过20个用户QQ号码及其好友总数
   SELECT R.QQID,COUNT(*) AS 人数
   FROM [QQ].[dbo].[Relation] R,[QQ].[dbo].[BaseInfo] B
   WHERE R.QQID=B.QQID 
   GROUP BY R.QQID
   HAVING COUNT(*)>1
   --10
   select top 20 r.RelationQQID,COUNT(*)AS 被拉黑人数次数
   from [QQ].[dbo].[Relation] r, [QQ].[dbo].[BaseInfo] b
   where r.RelationQQID=b.QQID  and r.RelationStatus=1
   group by r.RelationQQID
   order by COUNT(*)
   --修改数据
   --1
   update [QQ].[dbo].[QQUser] set Online=2
   where QQID=8855678
   --2
   UPDATE [QQ].[dbo].[BaseInfo] 
   SET NickName='被淹死的鱼' 
       ,Address='解放中路6号院106室'  
    where QQID=95001200
   --3
   update[QQ].[dbo].[Relation] set RelationStatus=1
   where QQID=8855678
   --4
    update [QQ].[dbo].[QQUser] set Level=Level+1
    where Level<6
    --5
    update [QQ].[dbo].[QQUser] set Level=-1 
    where  DATEDIFF(dd,LastLogTime,GETDATE())>365
    --6
    update [QQ].[dbo].[QQUser] set Level=Level+1 
    where QQID in (select QQID from [QQ].[dbo].[Relation] group by QQID 
    having COUNT(*)>20)
    --7
    update [QQ].[dbo].[Relation] set RelationStatus=1
     where RelationQQID in(select QQID from [QQ].[dbo].[BaseInfo]where NickName='嘟嘟鱼' )
     AND QQID=286314 AND RelationStatus=0