SQL Server , split a time duration row by 24 hour period

Question

I\'m working on sql server 2008 r2. I\'m trying to split a row by 24 hours period ranges between FromDate, Todate. For example, if a time r

Answer 1

http://sqlfiddle.com/#!6/36452/2

This should be what you need. The first part of the query is a recursive CTE. This can be used to create the dates-data.

WITH CTEDays AS
(
    SELECT CONVERT(date, '20140301') datevalue
 UNION ALL
    SELECT DATEADD(day, 1, C.datevalue)
    FROM CTEDays C
    WHERE DATEADD(day, 1, C.datevalue) <= '20140501'
)
SELECT 
    R.FromDate [FromOriginal]
    , R.ToDate [ToOriginal]
    , CDays.datevalue [RawDate]
    , WantedFrom = 
        CASE WHEN CONVERT(date, R.FromDate) = CDays.datevalue THEN R.FromDate
             ELSE CDays.datevalue
        END
    , WantedTo = 
        CASE WHEN CONVERT(date, R.ToDate) = CDays.datevalue THEN R.ToDate
             ELSE DATEADD(minute, 24*60-1, CONVERT(datetime, CDays.datevalue))
        END
FROM 
    tblRange R
    OUTER APPLY
    (
        SELECT C.datevalue
        FROM CTEDays C
        WHERE C.datevalue BETWEEN CONVERT(date, R.FromDate) AND CONVERT(date, R.ToDate)
    ) CDays

However, I would suggest to set up a calendar table for this, if the CTE is too slow or inconvenient.

(as I have suggested here)