带有 cte 的表值函数

Question

我试图循环使用给定参数 From 和 To Date 的 cte。我阅读了这个create while loop with cte 并在我的查询中尝试了它，但结果只显示了开始日期和下一个日期。

DECLARE @fromdate datetime
DECLARE @todate datetime
SET @fromdate='2013-07-23'
SET @todate='2013-07-24'

;with dates(num) as (
  select @fromdate as fromdate
  union all
  select @fromdate + 1
  from dates
  where dates.num < @todate      
 ),
    T(employee_id,actualogin,actuallogout) as (
     select d.*
     from dates cross apply
     dbo.ufn_GET_ATTENDANCE(dates.num) d
 )
 SELECT * FROM T
 OPTION (MAXRECURSION 0)

Answer 1

我倾向于先获取日期列表，然后应用函数：

with dates as (
      select @fromdate as date
      union all
      select date + 1
      from dates
      where dates.date < @todate
    ),
    T(employee_id,actualogin,actuallogout) as (
     select t.*
     from dates cross apply
          dbo.ufn_GET_ATTENDANCE(dates.date)
    )