Sql 日期/日历表中连续交易假日的最大数量

我试图从交易日期/日历表中找到连续交易假期的最大数量。我在

TradingDate

表中有一个标志

isTradingHoliday=1

，表示交易假日的日期，否则

isTradingHoliday=0

。如何知道该

TradingDate

表中哪个日期范围是最连续的交易假日

这听起来像是一个缺口和孤岛问题。您可以使用行号的差来查找第一个日期和天数。其余部分是聚合和筛选：

select top (1) with ties min(tradingdate) as startdate,
       max(tradingdate) as enddate
from (select c.*,
             row_number() over (order by tradingdate) as seqnum,
             row_number() over (partition by isTradingHoliday order by tradingdate) as seqnum_h
      from calendar c
     ) c
where isTradingHoliday = 1
group by isTradingHoliday, (seqnum - seqnum_h)
order by count(*) desc