SqlServer 2008 建立测试数据的要领【MySQL教程】,SqlServer,2008,数据

包括要点：数据库的轮回、 insert select 句式、随机数（ rand（）函数）、绝对值（ abs（）函数）

DECLARE @starttime varchar(50)
  DECLARE @endtime varchar(50)
  DECLARE @randomvalue float
  SET @starttime='2017-09-15 00:15:00.000'
  SET @endtime='2017-10-20 00:00:00.000'
--  set @randomvalue=floor(rand()*10)
-- -- select CONVERT(varchar(50), DATEADD(mi,15,@starttime),121)
--select [TagID],[Value]-@randomvalue,[StartValue]-@randomvalue,CONVERT(varchar(50),DATEADD(mi,15,[StartTime]),121),[EndValue]-@randomvalue,CONVERT(varchar(50),DATEADD(mi,15,[EndTime]),121)
--from [dbo].[DimTagMinuteData] where TagID in (1,
--                                                2,3,4,5,6,
--                                                7,8,9,10,11,
--                                                12,13,14,15,16,
--                                                17,18,19,20
--                                                )
--and StartTime=@starttime and EndTime=CONVERT(varchar(50),DATEADD(mi,15,@starttime),121)
  WHILE @starttime<=@endtime
     begin
        set @randomvalue=floor(rand()*10)
        IF @starttime<=@endtime
            BEGIN
                insert INTO DimTagMinuteData ([TagID],[Value],[StartValue]
      ,[StartTime]
      ,[EndValue]
      ,[EndTime])
                select [TagID] , 
                ABS([Value]-@randomvalue)    ,
                ABS([StartValue]-@randomvalue),
                CONVERT(varchar(50),DATEADD(mi,15,[StartTime]),121),
                ABS([EndValue]-@randomvalue),
                CONVERT(varchar(50),DATEADD(mi,15,[EndTime]),121)
                from [dbo].[DimTagMinuteData] where TagID in (1,
                                                                2,3,4,5,6,
                                                                7,8,9,10,11,
                                                                12,13,14,15,16,
                                                                17,18,19,20
                                                                )
                and StartTime=@starttime and EndTime=CONVERT(varchar(50),DATEADD(mi,15,@starttime),121)
            end
            
        else    
            begin
                print 'stop'
            end    
            
        set @starttime= CONVERT(varchar(50), DATEADD(mi,15,@starttime),121)
     end
     
    -- 随机数
  select floor(rand()*100)固然 轮回的时刻 能够不必 if  else   推断

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