Question

我有2张桌子。表A和表B。我需要创建表C。表B是时间序列表，每天有一条记录。我正在使用Azure SQL 我想将行分成每个月，如下所示：

表A

StartDate     EndDate
2018-02-12   2019-02-12

表B

Date        Day       Month      Year
2018-01-01  Monday    Jan          2018
2018-02-02  Tuesday    Feb         2018
:
:
2019-12-31  Tuesday    Dec         2019

输出

Table C
StartDate   EndDate      Month   
2018-02-12  2018-02-28   Feb
2018-03-01  2018-03-31   March
:
:
2019-02-01  2019-02-12   Feb

Answer 1

您可以通过将TableB分组并使用TableA作为过滤器来做到这一点。

select
     min(date) as StartDate
    ,max(date) as EndDate
    ,Month
from TableB
where date >= (select StartDate from TableA)
and date <= (select EndDate from TableA)
group by Month,Year

当tableB中有更多行时（附加列id）：

select
     min(date) as StartDate
    ,max(date) as EndDate
    ,Month
    ,a.id
from TableB b
join TableA a
    on b.Date between a.StartDate and a.EndDate
group by id,Month,Year

如何在SQL中根据月将一行分为12？

1 个答案: