CODEWITHSUNDEEP
sqlsql-servert-sqlsql-server-2008
Peter
Peter

Reputation: 651

Getting Time Interval from Datetime

I have a table called Timezone and the data looks like:

Call_ID        Start_Time
93856          2011-08-04 09:59:47.000
58796          2011-08-05 14:54:37.000
25489          2011-08-09 15:32:13.000

I want the output as :

Call_ID        Start_Time                    Interval
93856          2011-08-04 09:59:47.000       0930
58796          2011-08-05 14:54:37.000       1430
25489          2011-08-09 15:32:13.000       1530

I did something like this:

Select  Call_ID , Start_Time,
CASE WHEN DATEPART(minute,Start_Time)>30 THEN 
RIGHT('0' + CAST(DATEPART(HOUR,Start_Time) AS VARCHAR),2) + '30'          
ELSE 
RIGHT('0' + CAST(DATEPART(HOUR,Start_Time) AS VARCHAR),2) + '00'        
END
From Timezone
Group By Call_ID , Start_Time,
CASE WHEN DATEPART(minute,Start_Time)>30 THEN 
RIGHT('0' + CAST(DATEPART(HOUR,Start_Time) AS VARCHAR),2) + '30'          
ELSE 
RIGHT('0' + CAST(DATEPART(HOUR,Start_Time) AS VARCHAR),2) + '00'        
END

Is there a better way of doing it?

Upvotes: 4

Views: 1683

Answers (2)

Mikael Eriksson
Mikael Eriksson

Reputation: 138960

select Call_ID,
       Start_Time,
       right(100+datepart(hour, Start_Time), 2)+
       right(100+30*(datepart(minute, Start_Time)/30), 2) as Interval
from TimeZone

Upvotes: 4

Aaron Bertrand
Aaron Bertrand

Reputation: 280262

Not really any shorter, but certainly tidier with far less casts and string concatenation:

;WITH intervals(h) AS
(
  SELECT TOP (48) CONVERT(TIME(0), DATEADD(MINUTE, 30*(number), '00:00'))
    FROM master..spt_values
    WHERE number >= 0
    GROUP BY number
    ORDER BY number
)
SELECT
  t.Call_ID,
  t.Start_Time,
  Interval = REPLACE(CONVERT(VARCHAR(5), i.h), ':', '')
FROM intervals AS i
INNER JOIN dbo.TimeZone AS t
ON DATEDIFF(MINUTE, i.h, CONVERT(TIME(0), t.Start_Time)) BETWEEN 1 AND 30;

Not sure what you wanted to do if you have a value right on the boundary. Do you want it to fall in the current interval or the previous? You can change BETWEEN 1 AND 30 to BETWEEN 0 AND 29 if you want different behavior.

Upvotes: 0

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