Question

我试图使用给定的参数From和To Date循环一个cte。我读了这个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

我倾向于首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)
    )

表值 - 具有cte的函数

1 个答案: