1

我使用了Get a list of dates between two dates 中的一个函数，这个函数工作得很好。

但是，我需要对已通过的结束日期进行额外检查。有时这个日期会是空的，因为如果记录仍然是最新的，它就不会被输入。如果是，我想用当前日期替换它，以便日期从开始日期返回到当前日期。

我要输入的代码是这样的，但是无论我尝试放在哪里，都会出现语法错误。

 IF @endddate IS NULL
     SET @enddate = getdate()

这是目前的代码

 CREATE FUNCTION [dbo].[ExplodeDates](@startdate datetime, @enddate datetime) 
 returns table as 
 return ( 
 with  
 N0 as (SELECT 1 as n UNION ALL SELECT 1) 
,N1 as (SELECT 1 as n FROM N0 t1, N0 t2) 
,N2 as (SELECT 1 as n FROM N1 t1, N1 t2) 
,N3 as (SELECT 1 as n FROM N2 t1, N2 t2) 
,N4 as (SELECT 1 as n FROM N3 t1, N3 t2) 
,N5 as (SELECT 1 as n FROM N4 t1, N4 t2) 
,N6 as (SELECT 1 as n FROM N5 t1, N5 t2) 
,nums as (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) as num FROM N6) 
SELECT DATEADD(day,num-1,@startdate) as thedate 
FROM nums 
WHERE num <= DATEDIFF(day,@startdate,@enddate) + 1 
 );

任何帮助将不胜感激。

4

1 回答 1

2

您需要再添加 1CTE来过滤该@enddate值。

试试这个 ： -

CREATE FUNCTION dbo.ExplodeDates(@startdate datetime, @enddate datetime)
returns table as
return (
with 
 N0 as (SELECT 1 as n UNION ALL SELECT 1)
,N1 as (SELECT 1 as n FROM N0 t1, N0 t2)
,N2 as (SELECT 1 as n FROM N1 t1, N1 t2)
,N3 as (SELECT 1 as n FROM N2 t1, N2 t2)
,N4 as (SELECT 1 as n FROM N3 t1, N3 t2)
,N5 as (SELECT 1 as n FROM N4 t1, N4 t2)
,N6 as (SELECT 1 as n FROM N5 t1, N5 t2)
,nums as (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) as num FROM N6)
,checkDate as (select case when
                          @enddate is null then getdate() 
                          else @enddate
                      end as  dt)
SELECT DATEADD(day,num-1,@startdate) as thedate
FROM nums
WHERE num <= DATEDIFF(day,@startdate,(Select dt from checkDate)) + 1
);
于 2013-03-19T11:20:37.350 回答