Question

我必须将表转换为另一个表。我有这些行：

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问题是日期不是连续的，最近可以重复数量。所需的输出如下：

quantity   fdate
3          2006.10.11.
6          2006.10.18.
6          2006.10.19.
6          2006.10.23.
4          2006.10.25.
6          2006.10.28.
6          2006.10.30.

看起来很简单，但是分组，分钟，最大值，等级都无法帮助我，我无法找到诀窍。我怎样才能做到这一点？谢谢你提前。

Answer 1

希望这会有所帮助：

SQL> 
SQL> WITH table_(quantity  , fdate) AS
  2  (select 3, to_date('2006.10.11.', 'yyyy.mm.dd.') from dual union all
  3   select 6, to_date('2006.10.18.', 'yyyy.mm.dd.') from dual union all
  4   select 6, to_date('2006.10.19.', 'yyyy.mm.dd.') from dual union all
  5   select 6, to_date('2006.10.23.', 'yyyy.mm.dd.') from dual union all
  6   select 4, to_date('2006.10.25.', 'yyyy.mm.dd.') from dual union all
  7   select 6, to_date('2006.10.28.', 'yyyy.mm.dd.') from dual union all
  8   select 6, to_date('2006.10.30.', 'yyyy.mm.dd.') from dual),
  9   -------
 10   -- End of data preparation
 11   -------
 12  table2 AS ( select quantity  ,
 13                      fdate,
 14                      row_number() OVER (ORDER BY fdate) -
 15                      row_number() OVER (PARTITION BY quantity ORDER BY fdate) AS grp
 16                FROM table_)
 17  SELECT quantity, to_char(MIN(fdate), 'yyyy.mm.dd.') START_DT, to_char(MAX(fdate), 'yyyy.mm.dd.') END_DT
 18    FROM table2
 19  GROUP BY quantity, grp
 20  ORDER BY 2
 21  /

  QUANTITY START_DT    END_DT
---------- ----------- -----------
         3 2006.10.11. 2006.10.11.
         6 2006.10.18. 2006.10.23.
         4 2006.10.25. 2006.10.25.
         6 2006.10.28. 2006.10.30.

SQL>

Oracle日期范围从不连续的日期开始

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