Sql Crystal报表需要按派生日期范围分组

长时间列表，第一次调用。我正在使用Crystal Reports 2010

我有每日交易信息，如果交易量不变，我需要将这些信息组合在一起。下面是数据的样子

交易开始日期结束日期卷 我需要它看起来像这样

交易日期范围卷

---

我需要根据导出的日期范围进行分组，但我不确定如何使用Crystal实现这一点。有什么想法吗？

我会使用X-2抑制功能来隐藏每一行中除最后一行之外的所有内容，以及上一行和下一行以查找端点

with w as (
     select 1 id, to_date('1/1/2012', 'mm/dd/yyyy') db, to_date('1/2/2012', 'mm/dd/yyyy') de, 500 s from dual
     union all
     select 1, to_date('1/2/2012', 'mm/dd/yyyy'), to_date('1/3/2012', 'mm/dd/yyyy'), 500 from dual
     union all
     select 1, to_date('1/3/2012', 'mm/dd/yyyy'), to_date('1/4/2012', 'mm/dd/yyyy'), 1000 from dual
     union all
     select 1, to_date('1/4/2012', 'mm/dd/yyyy'), to_date('1/5/2012', 'mm/dd/yyyy'), 750 from dual
     union all
     select 1, to_date('1/5/2012', 'mm/dd/yyyy'), to_date('1/6/2012', 'mm/dd/yyyy'), 750 from dual
     union all
     select 1, to_date('1/6/2012', 'mm/dd/yyyy'), to_date('1/7/2012', 'mm/dd/yyyy'), 500 from dual
     union all
     select 1, to_date('1/7/2012', 'mm/dd/yyyy'), to_date('1/8/2012', 'mm/dd/yyyy'), 500 from dual
     union all
     select 1, to_date('1/8/2012', 'mm/dd/yyyy'), to_date('1/9/2012', 'mm/dd/yyyy'), 510 from dual      
     )

select tmin.db, tmax.de, tmin.s
from
(     
  select 
       row_number() over (order by db) id,
           db,
           s
  from   
  ( 
      select
           db,
           s,
           case 
                  when ps is null
                       then 1
                  when ps != s
                       then row_number() over (order by db) 
               else 0 end num
       from (

           select 
                   (db)
                  , (de)
                  , lag (s,1) over (ORDER BY db) ps                
                  , s


           from w
           ) t
  ) t1
  where num != 0
 ) tmin,

 (select 
     row_number() over (order by db) id,
         de,
         s
from   
(      
    select
           db,
             de,

             s,
             case 
                when ps is null
                     then 1
                when ps != s
                     then row_number() over (order by de desc) 
             else 0 end num
     from (

         select 
                  db
                ,(de)
                , lag (s,1) over (ORDER BY de desc) ps                
                , s                

         from w
         order by db
         ) t
 ) t1
where num != 0) tmax

where tmin.id = tmax.id

按起始日期分组；抑制详细信息和组页脚部分

在组头的某个位置创建{@UpdateCurrentBegDate}函数

WhilePrintingRecords;    
Global DateVar CurrentBegDate;

If PreviousIsNull({table.Volume}) or Previous({table.Volume}) <> {table.Volume}
    Then ( //We found a new range
        CurrentBegDate = {table.BegDate};
     );

""; //Display nothing on screen

转到节专家，单击组标题节的抑制选项旁边的X-2。这是这里的公式

Not(NextIsNull({table.Volume}) or Next({table.Volume}) <> {table.Volume})

---

如果需要进行总计或其他计算，可以在{@UpdateCurrentBegDate}函数中进行，并希望将名称更改为{@UpdateCurrentValues}或类似的名称。如果您只想在组更改时更改内容，还可以创建一个新函数来检查下一个信息-使用默认的合计函数将包括隐藏值。

这是我能想到的最优雅的解决方案

WITH DirectTrades(tradeid, SourceDate, EndDate, Volume, Row, KillRow, Depth) AS 
(
    SELECT  tradeid
            BegDate AS SourceDate, 
            EndDate,
            Volume,
            ROW_NUMBER() over (partition by Table# order by BegDate) AS Row,
            ROW_NUMBER() over (partition by Table# order by BegDate) AS KillRow,
            0 AS Depth
    FROM    Trade
    UNION ALL
    SELECT  t1.Tradeid
            dt.SourceDate, 
            t1.EndDate, 
            t1.Volume, 
            dt.Row, 
            dt.Row + dt.Depth + 1,
            dt.Depth + 1
    FROM    Trade AS t1
            INNER JOIN 
            DirectTrades AS dt ON 
                    t1.BegDate=dt.EndDate AND 
                    t1.Volume=dt.Volume AND
                    t1.tradeid=dt.Tradeid
)

SELECT  dt1.Tradeid
        dt1.SourceDate,
        dt1.EndDate,
        dt1.Volume 
FROM    DirectTrades dt1
        INNER JOIN
        (
        SELECT dt2.Row, 
                MAX(dt2.KillRow) AS KillRow
        FROM    DirectTrades dt2
        WHERE   dt2.Row NOT IN
                (
                SELECT dt3.KillRow
                FROM    DirectTrades dt3
                WHERE   dt3.Depth <> 0  
                )
        GROUP BY    dt2.Row
        ) dt4 ON dt1.Row=dt4.Row AND dt1.KillRow=dt4.KillRow 
ORDER BY SourceDate

---

我认为这个问题类似于伟大的，我没有看到我需要一个纯SQL的解决方案，直到张贴这篇文章。不过我不会删除它，它回答了原来的问题。谢谢你的回答。即使我也不会删除它。我身上有一些限制，这就产生了对纯SQL解决方案的需求。我还没有试着测试Stevo的答案。如果有人需要这样的解决方案，我会把你的留在这里+为了你的利益。同时，请确保您得到一个仅基于SQL的解决方案。这将是一个很大的帮助。工作，但不可理解，因此不可复制+1只是为了你的兴趣。工作完美，看起来是完成工作所需的最低代码。仍在寻找更多的解决方案+我得到的最好、最简洁的答案。谢谢+不起作用。我有表名TradeID、BEGDATE、ENDDATE、VOLUME以及问题中描述的数据。请提供符合模式的解决方案，并相应地编辑您的答案。

WhilePrintingRecords;    
Global DateVar CurrentBegDate;

If PreviousIsNull({table.Volume}) or Previous({table.Volume}) <> {table.Volume}
    Then ( //We found a new range
        CurrentBegDate = {table.BegDate};
     );

""; //Display nothing on screen

EvaluateAfter({@UpdateCurrentBegDate});
Global DateVar CurrentBegDate;

Not(NextIsNull({table.Volume}) or Next({table.Volume}) <> {table.Volume})

WITH DirectTrades(tradeid, SourceDate, EndDate, Volume, Row, KillRow, Depth) AS 
(
    SELECT  tradeid
            BegDate AS SourceDate, 
            EndDate,
            Volume,
            ROW_NUMBER() over (partition by Table# order by BegDate) AS Row,
            ROW_NUMBER() over (partition by Table# order by BegDate) AS KillRow,
            0 AS Depth
    FROM    Trade
    UNION ALL
    SELECT  t1.Tradeid
            dt.SourceDate, 
            t1.EndDate, 
            t1.Volume, 
            dt.Row, 
            dt.Row + dt.Depth + 1,
            dt.Depth + 1
    FROM    Trade AS t1
            INNER JOIN 
            DirectTrades AS dt ON 
                    t1.BegDate=dt.EndDate AND 
                    t1.Volume=dt.Volume AND
                    t1.tradeid=dt.Tradeid
)

SELECT  dt1.Tradeid
        dt1.SourceDate,
        dt1.EndDate,
        dt1.Volume 
FROM    DirectTrades dt1
        INNER JOIN
        (
        SELECT dt2.Row, 
                MAX(dt2.KillRow) AS KillRow
        FROM    DirectTrades dt2
        WHERE   dt2.Row NOT IN
                (
                SELECT dt3.KillRow
                FROM    DirectTrades dt3
                WHERE   dt3.Depth <> 0  
                )
        GROUP BY    dt2.Row
        ) dt4 ON dt1.Row=dt4.Row AND dt1.KillRow=dt4.KillRow 
ORDER BY SourceDate