Question

我目前有一张包含创建日期和到期日期的表格。我目前有一个sql命令来获取给定日期的有效项目数。

select 
    count(id) ,CONVERT(date, getdate()) 
 from 
    table 
 where 
    createDate < getdate() and expDate > getdate()

这将返回计数和当前日期。

是否可以编写一个sql查询来返回一系列日期的结果，比方说我想在15天的范围内绘制有效项目的数量？

谢谢！

Answer 1

检查一下，

DECLARE @StartDate  DATETIME,
        @EndDate    DATETIME;

SELECT   @StartDate = '20110501'        
        ,@EndDate   = '20110801';

SELECT  
        DATEADD(d, x.number, @StartDate) AS MonthName1
        ,
        x.number
FROM    master.dbo.spt_values x
WHERE   x.type = 'P'        
AND     x.number <= DATEDIFF(MONTH, @StartDate, @EndDate);

上述查询提供了2个日期之间的日期列表。

根据您的表格和问题，请同时查看。

declare @table table(id int,frdt datetime, todt datetime)

insert into @table values (1,GETDATE()-20, GETDATE()-19)
,(2,GETDATE()-9, GETDATE()-8)
,(3,GETDATE()+20, GETDATE()+18)
,(4,GETDATE(), GETDATE()-1)
,(5,GETDATE()-20, GETDATE())
,(6,GETDATE()-10, GETDATE()+10 )

select * from @table

declare @frdt datetime = null , @todt datetime = getdate()-10

select @frdt, @todt,* from @table
where
 (@frdt is null or @frdt between frdt and todt)
and
 (@todt is null or @todt between frdt and todt)

 select @frdt = GETDATE()-15 , @todt = GETDATE()

 select @frdt, @todt,* from @table
where
 (@frdt is null or @frdt between frdt and todt)
 and 
 (@todt is null or @todt between frdt and todt)

Answer 2

试试这个：

create table #datelist (ValidDateCheck date, ValidResults int)

declare @startdate date = '1/1/2015'
declare @enddate date = '2/1/2015'
declare @interval int = 1 --Use 1 if you want every day between your dates, use 2 if you want every other day, etc.

declare @datecounter date = @startdate
declare @count int

while @datecounter <= @enddate
begin
set @count = 
    (select count(*) 
    from Table 
    where CrtDt <= @datecounter and ExpDt > @datecounter)
insert into #datelist values (@datecounter, @count)
set @datecounter = dateadd(dd, @interval, @datecounter)
end

select * from #datelist order by 1

它遍历您范围内的所有日期，计算每个日期的有效结果。

显示一系列日期的有效结果数

2 个答案: