我从一个被问到的StackOverflow问题中得到了这个例子,但根据我的需要,我无法让它工作。
WITH DateTable
AS
(
SELECT CAST('20110101' as Date) AS [DATE]
UNION ALL
SELECT DATEADD(dd, 1, [DATE]) FROM DateTable
WHERE DATEADD(dd, 1, [DATE]) < cast('20110131' as Date)
)
SELECT dt.[DATE] FROM [DateTable] dt
输入 -
ID | FromDate | ToDate
=============================
1 | 2011-11-10 | 2011-11-12
2 | 2011-12-12 | 2011-12-14
输出 -
SN | Dates |
==================
1 | 2011-11-10 |
2 | 2011-11-11 |
3 | 2011-11-12 |
4 | 2011-12-12 |
5 | 2011-12-13 |
6 | 2011-12-14 |
请参阅此代码适用于静态日期。但在我的情况下,我有一个包含三列Id, FromDate, ToDate
的表。现在我想将每行中的每个范围转换为各个日期。
如果范围来自表格,我无法得到上面的例子,显然这个查询必须为范围表中的每一行运行,这是另一个令人困惑的挑战。
请帮忙。
答案 0 :(得分:4)
create table Dates (Id int, FromDate date, ToDate date)
insert into Dates values (1, '2011-11-10', '2011-11-12')
insert into Dates values (2, '2011-12-12', '2011-12-14')
with DateTable as
(
select FromDate as Dt, ToDate
from Dates
union all
select DATEADD(D, 1, Dt), ToDate
from DateTable
where DATEADD(D, 1, Dt) <= ToDate
)
select ROW_NUMBER() over (order by Dt) as SN, Dt as Dates
from DateTable
order by Dt
答案 1 :(得分:4)
在数字表的帮助下。
declare @T table
(
ID int identity primary key,
FromDate date,
ToDate date
)
insert into @T values
('2011-11-10', '2011-11-12'),
('2011-12-12', '2011-12-14')
select row_number() over(order by D.Dates) as SN,
D.Dates
from @T as T
inner join master..spt_values as N
on N.number between 0 and datediff(day, T.FromDate, T.ToDate)
cross apply (select dateadd(day, N.number, T.FromDate)) as D(Dates)
where N.type ='P'
试试SE Data
答案 2 :(得分:1)
这个怎么样?
--DROP TABLE #Test
CREATE TABLE #Test(ID int, FromDate datetime, ToDate datetime)
INSERT INTO #Test VALUES (1, '2011-11-10', '2011-11-12')
INSERT INTO #Test VALUES (2, '2011-12-12', '2011-12-14')
;
WITH DateTable
AS
(
SELECT ID, FromDate, ToDate, 0 AS Seed FROM #Test
UNION ALL
SELECT ID, DATEADD(dd, 1, FromDate), ToDate, Seed + 1
FROM DateTable
WHERE DATEADD(dd, 1, FromDate) <= ToDate
)
SELECT --*
ROW_NUMBER() OVER (ORDER BY ID, Seed) SN, FromDate AS Dates
FROM DateTable