水平多列 - 按月分组

Posted 2023-05-08

【中文标题】水平多列 - 按月分组

【英文标题】：Multiple columns horizontally - Group By month

【发布时间】：2021-03-29 00:01:47

【问题描述】：

我有一些返回以下信息的 SQL：

Date	Month	Balance	Transactions
01/01/2020	January	20	Test 1
02/01/2020	January	21	Test 2
01/02/2020	February	20	Test 3
02/02/2020	February	21	Test 4

我想获取信息，所以它是这样的：

Date	January	Balance	Transactions	Date	February	Balance	Transactions
01/01/2020	January	20	Test 1	01/02/2020	February	20	Test 3
02/01/2020	January	21	Test 2	02/02/2020	February	21	Test 4

有什么想法吗？我试过 Pivots，它很接近，但不存在。

提前感谢您的帮助！

【问题讨论】：

很接近，但不在那里。 - 请告诉我们它与您的代码有多接近。 Pivot 不应该是close：它是否做某事（基于固定数量和列名的简单要求）。

【参考方案1】：

如果我理解正确，您可以将条件聚合与row_number() 一起使用：

select max(case when month = 'January' then date end),
       'January',
       max(case when month = 'January' then balance end),
       max(case when month = 'January' then transactions end),
       max(case when month = 'February' then date end),
       'February',
       max(case when month = 'February' then balance end),
       max(case when month = 'February' then transactions end)           
from (select t.*,
             row_number() over (partition by month order by date) as seqnum
      from t
     ) t
group by seqnum
order by seqnum;