SQL 第五章 我的租房网

use HOUSE  select * from hos_house  --房间信息表  select * from hos_district  --区县表  select * from hos_street    --街道表  select * from hos_type    --房间类型表    --1.内容扩充：临时表  --如果表名前面有#，那么创建的表是临时表，位于tempdb数据库下  --的临时表文件夹下。  create table #mytemp2222  (    id int identity(1,1) primary key not null,    name nvarchar(20)  )      --任务一：分页显示查询出租房信息  --*******************方式一：双top，双order by分页************************  --查询输出第6条~第10条房屋出租信息    --did:区县编号(hos_district)    select top 5 *,hos_district.did  from hos_house,hos_street,hos_district  where  hmid  not in(select top 5 hmid from hos_house)  and hos_house.sid=hos_street.sid  and hos_street.sdid=hos_district.did    --*******************方式二：Row_Number() over(order by id)***************  select * from   (select *,row_number() over(order by hmid) as myid  from hos_house) as temp  where myid between 6 and 10  --*******************方式三：临时表分页***********************************  --查询输出第6条~第10条房屋出租信息  use house  select identity(int,1,1) as myid, UID, SID, HTID, PRICE, TOPIC, CONTENTS, HTIME, COPY  into #housetemp  from hos_house  --通过临时表我们发现，其实实现分页只有两中思路，一种是通过双top，双order by方式，  --另外一种方式就是用一定的手段(可以使系统提供Row_NUmber()函数，也  --可以通过identity(int,1,1)来产生)，在现有表上加上一个自动增长列。  select * from #housetemp  where myid between 6 and 10  --如何将临时表释放  drop table #housetemp  --练习2——查询指定客户发布的出租房屋信息  --需求说明::  --查询“张三”发布的所有出租房屋信息，并显示房屋分布的街道、区县    select DNAME as 区县,SNAME as 街道,HTNAME as 户型,price as 价格,topic as 标题,contents as 描述,htime as 时间,copy as 备注  from hos_district,  hos_street,  hos_type,  hos_house  where hos_house.sid=hos_street.sid  and hos_house.htid=hos_type.htid  and hos_street.sdid=hos_district.did  and uid=  (    select uid from sys_user    where uname='张三'  )  --阶段3：练习——按区县制作房屋出租清单  --根据户型和房屋所在区县和街道,为至少有2个街道有房屋出租的区县制作出租房屋清单  --方式一(推荐)：  select HTNAME as 户型,UNAME as 姓名,DNAME as 区县, SNAME as 街道  from hos_type,sys_user,hos_district,hos_street,hos_house  where hos_house.sid=hos_street.sid  and hos_type.htid=hos_house.htid  and sys_user.uid=hos_house.uid  and hos_district.did=hos_street.sdid  and hos_street.sdid in  (    select  hos_street.sdid    from  hos_street,hos_district,    (select distinct sid from hos_house) as temp    where hos_street.sid=temp.sid    and hos_street.sdid=hos_district.did    group by hos_street.sdid    having count(hos_street.sid)>=2  )    --方式二：  select HTNAME as 户型,UNAME as 姓名,DNAME as 区县, SNAME as 街道  from hos_type,sys_user,hos_district,hos_street,hos_house  where hos_house.sid=hos_street.sid  and hos_type.htid=hos_house.htid  and sys_user.uid=hos_house.uid  and hos_district.did=hos_street.sdid  and hos_house.SID in  (    select hos_street.SID    from hos_street    where sdid in    (      select sdid      from hos_street,(select distinct(SID) from hos_house) as temp     where hos_street.sid=temp.sid     group by sdid    having count(hos_street.SID)>=2    )  )      --阶段4：按季度统计本年发布的房屋出租数量  --要求输出本年1月1日至今的全部出租房屋数量，各区县  --出租房屋数量以及各街道、户型出租房屋数量。  use house  DECLARE @year int  --SET @year = DATEPART(yy,GETDATE())  set @year=2009    SELECT tmp.quarter AS '季度',hos_district.DNAME AS '区县',hos_street.SNAME AS '街道',  hos_type.HTNAME AS '户型',tmp.cnt AS '房屋数量'  FROM (    SELECT SID,HTID,COUNT(*) cnt,DATEPART(qq,HTIME) quarter    FROM hos_house    WHERE DATEPART(yy,HTIME)=@year    GROUP BY DATEPART(qq,HTIME),SID,HTID  ) tmp  --INNER JOIN sys_user ON (tmp.UID=sys_user.UID)  INNER JOIN hos_street ON(tmp.SID=hos_street.SID)  INNER JOIN hos_district ON(hos_street.SDID=hos_district.DID)  INNER JOIN hos_type ON(tmp.HTID=hos_type.HTID)      UNION    SELECT DATEPART(qq,HTIME),hos_district.DNAME,' 小计 ','  ',COUNT(*) AS '房屋数量'  FROM hos_house  INNER JOIN hos_street ON(hos_house.SID=hos_street.SID)  INNER JOIN hos_district ON(hos_street.SDID=hos_district.DID)  WHERE DATEPART(yy,HTIME)=@year  GROUP BY DATEPART(qq,HTIME),hos_district.DNAME    union    SELECT DATEPART(qq,HTIME),' 合计 ','  ','  ',COUNT(*) AS '房屋数量'  FROM hos_house  WHERE DATEPART(yy,HTIME)=@year  GROUP BY DATEPART(qq,HTIME)