2

How do I get hours of a day from 00 hrs to 23 hrs using recursive CTE?

It gives hours 00 to 24, but I need to exclude the 24 hrs in my result set or in other words I need only up to 00 to 23 hrs

My Code:

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

It gives hours 00 to 24, but I need to exclude the 24 hrs in my result set or in other words I need only up to 00 to 23 hrs

Actual result:

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

Expected Result:

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
Arulkumar
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Mar1009
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1 Answers1

2

Instead of
Select datediff(HOUR, @hr1Week, dateadd(DAY, 1, @hr1Week)), changing it to
Select datediff(HOUR, @hr1Week, dateadd(DAY, 1, @hr1Week)) - 1
will return the hours up to 23 only

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

Demo on db<>fiddle

Arulkumar
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