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SQL非常丑陋的GROUP BY

[英]SQL very ugly GROUP BY

 原文  2014-02-25 17:48:19  0   2    sql/ sql-server-2008

问题描述

夏令时计算。 我们在下面确实有一个非常丑陋的工作模型。

看到了这一点-SQL-GROUP BY和COALESCE的丑陋组合

如果我们可以设置变量，则此方法不起作用-同样，已删除count（*）以说明我们所遇到的问题。 

Declare @subtractor int;
    select top 10  case 
                  when LOGGED_TIME between  
                        case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                              when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                              else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                        end
                        and
                        case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                              when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                              else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                        end   
                  then 
                  Set @subtractor = 5;
                  else 
                  Set @subtractor = 6;
            end 
    CAST(DATEADD(HH, -@subtractor,LOGGED_TIME) AS date) AS ForDate
       , txtW=DATENAME(WEEKDAY, DATEADD(HH, -@subtractor,LOGGED_TIME))
       , intW=DATEPART(WEEKDAY, DATEADD(HH, -@subtractor,LOGGED_TIME))
       , intH=DATEPART(HOUR, DATEADD(HH, -@subtractor,LOGGED_TIME))
from SUPPORT_DATABASE.dbo.LOG (nolock)

确实可以。.但是，它是一个非常非常丑陋的GROUP BY ..有没有办法清理它？ 

select  top 10
 case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  CAST(dateadd(hh,-5,LOGGED_TIME) AS date) -- DST
            else  CAST(dateadd(hh,-6,LOGGED_TIME) AS date) -- DST
        end as ForDate,
 case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  DATENAME(WEEKDAY,dateadd(hh,-5,LOGGED_TIME)) -- DST
            else  DATENAME(WEEKDAY,dateadd(hh,-6,LOGGED_TIME)) -- DST
        end as txtW,
 case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  DATENAME(WEEKDAY,dateadd(hh,-5,LOGGED_TIME)) -- DST
            else  DATENAME(WEEKDAY,dateadd(hh,-6,LOGGED_TIME)) -- DST
        end as intW,
 case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  DATEPART(HOUR,dateadd(hh,-5,LOGGED_TIME)) -- DST
            else  DATEPART(HOUR,dateadd(hh,-6,LOGGED_TIME)) -- DST
        end as intH
        , COUNT(*) AS Totals
FROM         SUPPORT_DATABASE.dbo.LOG WITH (nolock)
 GROUP BY case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  CAST(dateadd(hh,-5,LOGGED_TIME) AS date) -- DST
            else  CAST(dateadd(hh,-6,LOGGED_TIME) AS date) -- DST
        end,
 case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  DATENAME(WEEKDAY,dateadd(hh,-5,LOGGED_TIME)) -- DST
            else  DATENAME(WEEKDAY,dateadd(hh,-6,LOGGED_TIME)) -- DST
        end
,
 case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  DATEPART(WEEKDAY,dateadd(hh,-5,LOGGED_TIME)) -- DST
            else  DATEPART(WEEKDAY,dateadd(hh,-6,LOGGED_TIME)) -- DST
        end,
 case 
            when LOGGED_TIME between  
                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end
                and
                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                end 
            then  DATEPART(HOUR,dateadd(hh,-5,LOGGED_TIME)) -- DST
            else  DATEPART(HOUR,dateadd(hh,-6,LOGGED_TIME)) -- DST
        end

2 个解决方案

解决方案1
 2 已采纳  2014-02-25 17:51:26

您可以将其包装在cte中，这样就可以使用别名GROUP BY了： 

 ;WITH cte AS ( select
                 case 
                            when LOGGED_TIME between  
                                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end
                                and
                                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end 
                            then  CAST(dateadd(hh,-5,LOGGED_TIME) AS date) -- DST
                            else  CAST(dateadd(hh,-6,LOGGED_TIME) AS date) -- DST
                        end as ForDate,
                 case 
                            when LOGGED_TIME between  
                                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end
                                and
                                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end 
                            then  DATENAME(WEEKDAY,dateadd(hh,-5,LOGGED_TIME)) -- DST
                            else  DATENAME(WEEKDAY,dateadd(hh,-6,LOGGED_TIME)) -- DST
                        end as txtW,
                 case 
                            when LOGGED_TIME between  
                                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end
                                and
                                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end 
                            then  DATENAME(WEEKDAY,dateadd(hh,-5,LOGGED_TIME)) -- DST
                            else  DATENAME(WEEKDAY,dateadd(hh,-6,LOGGED_TIME)) -- DST
                        end as intW,
                 case 
                            when LOGGED_TIME between  
                                case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                                    else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end
                                and
                                case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                                    when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                                    else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                                end 
                            then  DATEPART(HOUR,dateadd(hh,-5,LOGGED_TIME)) -- DST
                            else  DATEPART(HOUR,dateadd(hh,-6,LOGGED_TIME)) -- DST
                        end as intH
                FROM         SUPPORT_DATABASE.dbo.LOG WITH (nolock))
SELECT *,COUNT(*) CT
FROM cte
GROUP BY ForDate, txtW,  intW,  intH

这是一种简单的清理方式，确保它也需要重构。

解决方案2
 1  2014-02-25 17:58:25

您可以创建一个UDF： 

CREATE FUNCTION dbo.YourFunctionName (@DateTime DATETIME)
RETURNS DATE
AS
BEGIN
    RETURN
    (
        SELECT   case 
                when @DateTime between  
                    case DATEPART(dw,CAST('03/01/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime))
                        when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                        else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime)))
                    end
                    and
                    case DATEPART(dw,CAST('11/01/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime))
                        when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                        else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(@DateTime) as varchar(4)) as datetime)))
                    end 
                then  CAST(dateadd(hh,-5,@DateTime) AS date) -- DST
                else  CAST(dateadd(hh,-6,@DateTime) AS date) -- DST
            end
    );
END

那么您的查询就是： 

SELECT  dbo.YourFunctionName(LOGGED_TIME) AS ForDate,
        DATENAME(WEEKDAY, dbo.YourFunctionName(LOGGED_TIME)) AS txtW
....
GROUP BY dbo.YourFunctionName(LOGGED_TIME);

或者，如果您永远不会重复使用此功能并且不为此而创建，可以将逻辑移至APPLY，然后引用新列： 

SELECT  fd.ForDate,
        DATENAME(WEEKDAY, fd.ForDate) AS txtW
FROM    ...
        CROSS APPLY
        (
            SELECT  case 
                    when LOGGED_TIME between  
                        case DATEPART(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                            when 1 then dateadd(hh,-4,CAST('03/08/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))--2am minus 6 hours for conversion from UST going to DST
                            else        dateadd(hh,-4,DATEADD(d,15-datepart(dw,CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('03/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                        end
                        and
                        case DATEPART(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))
                            when 1 then dateadd(hh,-3,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime))  --2am minus 5 hours for conversion from UST going from DST
                            else        dateadd(hh,-3,DATEADD(d,8-datepart(dw,CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)),CAST('11/01/'+CAST (YEAR(LOGGED_TIME) as varchar(4)) as datetime)))
                        end 
                    then  CAST(dateadd(hh,-5,LOGGED_TIME) AS date) -- DST
                    else  CAST(dateadd(hh,-6,LOGGED_TIME) AS date) -- DST
                end as ForDate
        ) AS fd
GROUP BY fd.ForDate;

或最后，您可以使用子查询，而仅在外部查询中使用组。

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