SQL 服务器计算一个月的工作日数

Question

我有下面的样本数据

create table #Calendar (Dates  date)
insert into #Calendar values
('2021-11-01'),('2021-11-02'),('2021-11-03'),('2021-11-04'),('2021-11-05'),('2021-11-06'),
('2021-11-07'),('2021-11-08'),('2021-11-09'),('2021-11-10'),('2021-11-11'),('2021-11-12'),
('2021-11-13'),('2021-11-14'),('2021-11-15'),('2021-11-16'),('2021-11-17'),('2021-11-18'),
('2021-11-19'),('2021-11-20'),('2021-11-21'),('2021-11-22'),('2021-11-23'),('2021-11-24'),
('2021-11-25'),('2021-11-26'),('2021-11-27'),('2021-11-28'),('2021-11-29'),('2021-11-30')

我要的是统计一个月有多少个工作日。例如，对于 2021 年 11 月给出的样本数据，如果日期是星期六或星期日，则有 22 个工作日，星期五的工作编号将分配给这些日子周一 1 、周二 2 、周三 3 、周四 4 、周五 5 、周六 5 、周日 5 周一 7 等，直到我到达每个月都会重置的月份的最后一天

下面是我写的脚本

select
      Dates
      ,DENSE_RANK() OVER (ORDER BY CASE WHEN datepart(DW,Dates)-1 IN (0,6) THEN 5 ELSE datepart(DW,Dates)-1 END) AS WorkingDays
      ,DATENAME(dw,dates) as DaysName
from #Calendar
order by Dates

查询的问题是每周重置为从 1 开始

当前输出

预期输出

谢谢

Answer 1

而不是 dense_rank，您可以使用滚动条件 sum:

select
      Dates
      ,sum(case when datepart(DW,Dates)-1 IN (0,6) then 0 else 1 end) over (order by Dates) as WorkingDays
      ,datename(dw,Dates) as DaysName
from #Calendar
order by Dates

Answer 2

DROP TABLE  IF EXISTS #Calendar
CREATE table #Calendar (Dates  date)
insert into #Calendar values
('2021-11-01'),('2021-11-02'),('2021-11-03'),('2021-11-04'),('2021-11-05'),('2021-11-06'),
('2021-11-07'),('2021-11-08'),('2021-11-09'),('2021-11-10'),('2021-11-11'),('2021-11-12'),
('2021-11-13'),('2021-11-14'),('2021-11-15'),('2021-11-16'),('2021-11-17'),('2021-11-18'),
('2021-11-19'),('2021-11-20'),('2021-11-21'),('2021-11-22'),('2021-11-23'),('2021-11-24'),
('2021-11-25'),('2021-11-26'),('2021-11-27'),('2021-11-28'),('2021-11-29'),('2021-11-30')


SELECT c.Dates,
       (CASE WHEN DATENAME (dw, c.Dates) IN ( 'Saturday' )
             THEN LAG (s.WorkingDays, 1, 1) OVER (ORDER BY c.Dates)
             WHEN DATENAME (dw, c.Dates) IN ( 'Sunday' )
             THEN LAG (s.WorkingDays, 2, 1) OVER (ORDER BY c.Dates)
             ELSE s.WorkingDays
        END
       ) AS WorkingDays,
       DATENAME (dw, c.Dates) AS DaysName
FROM   #Calendar AS c
LEFT JOIN
       (
           SELECT cc.Dates,
                  ROW_NUMBER () OVER (ORDER BY cc.Dates) AS WorkingDays
           FROM   #Calendar AS cc
           WHERE  DATENAME (dw, cc.Dates) NOT IN ( 'Saturday', 'Sunday' )
       ) AS s
    ON s.Dates = c.Dates][1]][1]

输出 [1]: https://i.stack.imgur.com/Ysw9z.png

SQL 服务器计算一个月的工作日数

SQL Server calculate number of working dates in a month

sql

sql-server

sql-server-2008