Question

我想知道如何根据当前日期在sql server的列中插入工作日名称。我想插入当天的日子。例如，我想要今天（2014-12-04）的以下专栏，

day_of_week
-----------
Monday 
Tuesday
Wednesday
Thursday

在下周二（2014-12-09），我想显示，

day_of_week
-----------
Monday
Tuesday

请告诉我如何在sql server 2012中执行此操作？

任何帮助将不胜感激。

感谢。

Answer 1

这样的事情应该有效。

select datename(weekday,n) 
from (VALUES (0),(1),(2),(3),(4),(5),(6)) wdays(n)
where n < datepart(weekday,'20141209') - 1

如果您没有使用sql 2008及以上，则可以

select datename(weekday,n) 
from (select 0
union all
select 1
union all
select 2
union all
select 3
union all
select 4
union all
select 5
union all
select 6
) wdays(n)
where n < datepart(weekday,'20141209') - 1

Answer 2

也可以使用递归CTE来完成：

;WITH cte AS
(   
   SELECT DATENAME(weekday,getdate()) AS NameOfDay, 
          DAY(getdate()) AS NumberOfDay,
          getdate() AS curDate                   

   UNION ALL

   SELECT DATENAME(weekday,DATEADD(day, -1, curDate)) As NameOfDay, 
          DAY(DATEADD(day, -1, curDate)) AS NumberOfDay,
          DATEADD(day, -1, curDate) AS curDate
   FROM cte
   WHERE DAY(GETDATE()) - DAY(DATEADD(day, -1, curDate)) >= 0
)
SELECT NameOfDay
FROM cte  
ORDER BY NumberOfDay

如何根据给定日期在sql列中插入工作日名称？

2 个答案: