Question

我使用了来自Get a list of dates between two dates using a function的功能，效果非常好。

但是，我需要对传递的enddate进行额外检查。有时此日期将为null，因为如果记录仍然是最新的，则不会输入。如果是，我想用当前日期替换它，以便将日期从开始日期返回到当前日期。

我要输入的代码就是这样，但无论我在哪里尝试使用它，都会出现语法错误。

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

以下是代码

 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 
 );

非常感谢任何帮助。

Answer 1

您需要再添加1个CTE来过滤@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
);

在日期之间分解日期，检查并调整参数

1 个答案: