基于月度数据中特定条件的SQL报表

考虑以下数据：

+-----+--------+----------+-------+ | Ref | Colour | Month | Value | +-----+--------+----------+-------+ | 112 | Red | January | 16 | | 113 | Black | January | 10 | | 113 | Black | January | 11 | | 112 | Yellow | February | 10 | | 114 | Red | February | 7 | | 113 | Black | February | 10 | | 113 | Black | February | 14 | | 112 | Yellow | February | 15 | | 113 | Black | March | 8 | | 112 | Orange | March | 1 | | 114 | Blue | April | 6 | | 113 | Black | April | 4 | +-----+--------+----------+-------+ 我想查询此表以生成显示以下内容的报告：

在过去连续三个月内颜色=黑色的参考列表-根据样本数据，返回113

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编辑，我不得不简化原来的问题。

这有两个部分——数据透视和过滤过去三个月的数据。最简单的方法可能是聚合，然后使用：

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你需要中间结果，还是返回透视报告的单个查询？第一部分实际上对我来说更重要。如果他有所有的月份，这个查询会变得很长。我想知道是否还有更简洁的问题。我已经简化了原来的问题，第一部分对我来说更重要。

select ref,
       sum(case when month = 'January' then value else 0 end) as Jan,
       sum(case when month = 'February' then value else 0 end) as Feb,
       sum(case when month = 'March' then value else 0 end) as Mar,
       sum(case when month = 'April' then value else 0 end) as Apr
from t
where colour = 'Black'
group by ref
having sum(case when month = 'February' then value else 0 end) > 0 and
       sum(case when month = 'March' then value else 0 end) > 0 and
       sum(case when month = 'April' then value else 0 end) > 0;