Oracle SQL: sum( case when then quantity else 0 END) OVER (partition by ...) = can't get right GROUP BY statement答案

【问题标题】：Oracle SQL: sum( case when then quantity else 0 END) OVER (partition by...) = can't get right GROUP BY statementOracle SQL: sum( case when then quantity else 0 END) OVER (partition by ...) = can't get right GROUP BY statement
【发布时间】：2011-09-01 14:42:29
【问题描述】：

我正在尝试选择几个不同的总和，其中之一是 OVER (Partition by column_also_in_select_plan)。

但是我似乎永远无法正确使用 GROUP BY 语句。

例子：

Select 1, 2, 3, sum(4) over (partition by 3), sum(case when 6 = etc...) 
FROM table
Where filters
GROUP BY ?

感谢任何提示:)

【问题讨论】：

标签： sql group-by oracle11g windowing

【解决方案1】：

同时使用窗口函数进行聚合和并没有多大意义，所以我并不奇怪你会感到困惑。在上面的示例中，您可能希望将窗口移动到外部查询，即：

select 1, 2, 3, sum(sum4) over(partition by 3), ...
from (
      select 1, 2, 3, sum(4) as sum4
      from table
      where filters
      group by 1, 2, 3
) x

【讨论】：