在存储过程中创建临时表来重构数据

有下面两张表

这种情况下查询出来的结果按下面的形式显示:

ID	Name	Tm	Score
001	小小	2011-1-1	90
001	小小	2011-2-1	80
002	小强	2011-1-5	75

这种结果是通过Tab_Score inner jion Tab_Students 来实现的，导致每个时间有一个考核分数，然后进行罗列显示。

然而有时客户希望得到下面的显示结果。

ID	Name	年份	月份	上旬分数	中旬分数	下旬分数	全月分数

也就是每个月份有一个显示记录

作为一个和用户交互的、可分页存储过程一般包括下面几个输入参数：

     开始时间、结束时间、开始取值位置，结束取值位置、搜索条件、排序条件

下面是通过临时表来重构数据的一个查询：

--参数
declare    @startdate datetime='2011-01-15 08:00:00.000'
declare    @enddate datetime='2012-10-22 08:00:00.000'

declare  @startIndex int=1
declare    @endIndex int=100

declare @conditionStr nvarchar(200)='1<>0'
declare @orderStr nvarchar(200)='ID desc'
--临时表
drop table #MyTable
create table #MyTable
(
    ID nvarchar(50) not null,
    Name nvarchar(50) not null,
    Yr int not null,
    Mth int not null,
    UpScore int not null,
    MiddleScore int not null,
    DownScore int not null,
    AllScore int not null,
)
--获取月初时间
set @startdate=DATEADD(MM,DATEDIFF(MM,0,@startdate),0)
set @enddate=DATEADD(MM,DATEDIFF(MM,0,@enddate), 0)
--向临时表添加数据
while @startdate<@enddate
begin
      insert into #MyTable (ID,Name,Yr,Mth,UpScore,MiddleScore,DownScore,AllScore)
      select Tab_Students.ID,
             Tab_Students.Name,
             DATEPART(YEAR,@startdate)  as Yr,
             DATEPART(MONTH,@startdate)  as Mth,
             (
               select isnull(sum(Score),0) from Tab_Score
               where Tab_Score.ID =  Tab_Students.ID
                     and TM between @startdate and DATEADD(DAY,10,@startdate)
             )as UpScore,
             (
               select isnull(sum(Score),0) from Tab_Score
               where Tab_Score.ID =  Tab_Students.ID
                     and TM between DATEADD(DAY,10,@startdate) and DATEADD(DAY,20,@startdate)
             )as MiddleScore,
             (
               select isnull(sum(Score),0) from Tab_Score
               where Tab_Score.ID =  Tab_Students.ID
                     and TM between DATEADD(DAY,20,@startdate) and DATEADD(mm,1,@startdate)
             )as DownScore,
             (
               select isnull(sum(Score),0) from Tab_Score
               where Tab_Score.ID =  Tab_Students.ID
                     and TM between @startdate and DATEADD(mm,1,@startdate)
             )as AllScore
      from Tab_Students
   set @startdate=DATEADD(mm,1,@startdate)
end    
--结果查询
declare @selectStr nvarchar(1000)
set @selectStr='select * from #MyTable where ' + @conditionStr +' order by '+@orderStr 
exec (@selectStr)

 

 

--结果表
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[#MyTable]') AND type in (N'U'))
DROP TABLE [dbo].[#MyTable]
create table #MyTable
(
    DRP decimal(8,2),
    TM datetime
)


declare @DRP decimal(8,2)

--查询时段：8:00 .....8:00    雨量统计算结束时间的8:00-8:00
while @startTime<@endTime 
  begin
    select @DRP= isnull(sum(DRP),0)  FROM  ST_PPTN_R
    where 
    STCD = @STCD and 
    TM >DATEADD(hh,-1,@startTime) and TM<=@startTime and --向前推一个小时到当前时间
    STCD+','+cast(TM as Nvarchar) not in (select ST_PPTN_R_Add.STCD+','+cast(ST_PPTN_R_Add.TM as Nvarchar) from ST_PPTN_R_Add)
    
    insert into #MyTable(DRP,TM)
    values
    (
       @DRP, 
       @startTime--降雨结束时间
    )
    set @startTime=DATEADD(hh,1,@startTime)  
  end
select * from  #MyTable