mssql 30 minute time intervals beteen 2 datetime

Question

I have below query and i want to get datetime in 30 min intervals between 2 datetime. Basicly I got it, but is limitited and wouln\'t return al results if the timediff is over 2

Answer 1

using a recursive Common Table Expression [CTE] is one pretty clean method. For the formatting I am showing FORMAT() from SQL-Server 2012+ you may consider using DATEPART etc to do it though as FORMAT() can have performance impact.

I do agree with @RossBush's comment if you do things like this a lot generating a calendar (dates) and a time dimensions is very helpful for these purposes.

DECLARE @DateTime1 DATETIME = '2016/11/24 18:00:00'
DECLARE @DateTime2 DATETIME = '2016/11/25 06:00:00'

;WITH cte30MinIncrements AS (
    SELECT @DateTime1 as DT

    UNION ALL

    SELECT DATEADD(MINUTE,30,DT)
    FROM
       cte30MinIncrements
    WHERE DATEADD(MINUTE,30,DT) <= @DateTime2
)

SELECT
    *
    ,FORMAT(DT,'dd-HH:mm') as Formated
FROM
    cte30MinIncrements