如何为Oracle比较同一表中的行

Question

目前我有PLSQL代码来处理和计算数据。 但是问题是，如果没有PLSQL，即使用Oracle解析函数可以做到这一点吗？

该表包含计划和实际数据快照，如下所示：

data_snap_id    actual_dt   planned_dt  amount
------------    ---------   ---------   ------
1                           2014-10-01  20.00
1                           2014-10-02  10.00
1                           2014-10-03  5.00
1                           2014-10-04  10.00
1                           2014-10-05  51.00
1                           2014-10-06  10.00
1                           2014-10-07  50.00
1                           2014-10-08  15.00
1                           2014-10-09  55.00
1                           2014-10-10  100.00
2               2014-10-01  2014-10-01  25.00
2               2014-10-02  2014-10-02  5.00
2               2014-10-03  2014-10-03  15.00
2               2014-10-04  2014-10-04  15.00
2               2014-10-05  2014-10-05  5.00
2                           2014-10-06  10.00
2                           2014-10-07  50.00
2                           2014-10-08  15.00
2                           2014-10-09  55.00
2                           2014-10-10  10.00

预期的查询输出如下：

action_date planned_amount  actual_amount   adds    deletes
----------- --------------  -------------   ----    -------
2014-10-01  20.00           25.00           5.00    0.00
2014-10-02  10.00           5.00            0.00    5.00
2014-10-03  5.00            15.00           10.00   0.00
2014-10-04  10.00           15.00           5.00    0.00
2014-10-05  51.00           5.00            0.00    46.00
2014-10-06  5.00                            0.00    0.00
2014-10-07  50.00                           0.00    0.00
2014-10-08  15.00                           0.00    0.00
2014-10-09  55.00                           0.00    0.00
2014-10-10  100.00                          0.00    90.00

Answer 1

假设我正确理解了您的问题，则可以使用带有max和case的聚合查询来分隔您的计划金额和实际金额，然后使用子查询来获取您的添加和删除：

select action_date, 
  planned_amount,
  actual_amount,
  case when actual_amount-planned_amount < 0 
       then 0 else actual_amount-planned_amount end adds,
  case when planned_amount-actual_amount < 0 
       then 0 else planned_amount-actual_amount end deletes
from (
  select planned_dt action_date,
       coalesce(max(case when actual_dt is null then amount end),0) planned_amount,
       coalesce(max(case when actual_dt is not null then amount end),0) actual_amount
  from yourtable
  group by planned_dt
  ) t
order by action_date

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