如何使用递归CTE获得每天从00到23个小时的时间?
它提供00到24小时,但是我需要在结果集中排除24小时,换句话说,我最多只需要00到23小时
我的代码:
DECLARE @calenderDate DATETIME2(0) = '2019-05-16 05:00:00'
DECLARE @hr1Week int = 0
;with numcte AS
(
SELECT 0 [num]
UNION all
SELECT [num] + 1 FROM numcte WHERE [num] < (Select datediff(HOUR, @hr1Week, dateadd(DAY, 1, @hr1Week)))
)
select * from numcte
它提供00到24小时,但是我需要在结果集中排除24小时,换句话说,我最多只需要00到23小时
实际结果:
num
----
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
预期结果:
num
---
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
答案 0 :(得分:2)
代替
Select datediff(HOUR, @hr1Week, dateadd(DAY, 1, @hr1Week))
,将其更改为
Select datediff(HOUR, @hr1Week, dateadd(DAY, 1, @hr1Week)) - 1
将只返回最多23小时的小时数
DECLARE @calenderDate DATETIME2(0) = '2019-05-16 05:00:00'
DECLARE @hr1Week int = 0
;with numcte AS
(
SELECT 0 [num]
UNION all
SELECT [num] + 1 FROM numcte WHERE [num] <
(SEELCT datediff(HOUR, @hr1Week, dateadd(DAY, 1, @hr1Week)) -1)
)
SELECT * FROM numcte