VB.Net - SQL Qry DATEDIFF With Minutes and Seconds

Good Day Experts!

I am using the DATEDIFF in a qry to get the seconds between a Start and End time.  I would like to have the seconds in minutes and seconds if applicable.  

For example, I am getting 81 seconds on a record.  How do I get it to return 1:21?

Here is the line in my qry:

SUM(DATEDIFF(ss, [KEY START TIME], [KEY END TIME])) AS 'Key Time'

Thanks,
jimbo99999
Jimbo99999Asked:
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Jim HornMicrosoft SQL Server Data DudeCommented:
Something like this?

Declare @dt_start datetime = '2015-05-18 10:00:05', @dt_end datetime = '2015-05-18 10:02:14'
SELECT CAST(DATEADD(second, DATEDIFF(second, @dt_start, @dt_end), '19000101') as time) 

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btw the above converts to a time, essentially '1900-01-01' plus the time difference in seconds, displaying only the time part.  This enables you to sum these times for a grand total if that is your needs.

If that's not your needs, you can always display it as a varchar by doing the DATEDIFF, divide by 60 and that's the minutes, add a :, then divide and take the modulo for the seconds.

Declare @dt_start datetime = '2015-05-18 10:00:05', @dt_end datetime = '2015-05-18 10:02:14', @seconds int

SET @seconds = DATEDIFF(second, @dt_start, @dt_end)
SELECT RIGHT('00' + CAST(@seconds / 60 as varchar(10)),2)  + ':' + RIGHT('00' + CAST(@seconds % 60 as varchar(10)),2)

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Brian CroweDatabase AdministratorCommented:
DECLARE @StartTime      DATETIME = '5/18/2015 10:16',
      @EndTime            DATETIME = '5/18/2015 10:17:21';
      
SELECT @StartTime, @EndTime,
      CAST(DATEDIFF(SECOND, @StartTime, @EndTime) / 60 AS VARCHAR) + ':' + CAST(DATEDIFF(SECOND, @StartTime, @EndTime) % 60 AS VARCHAR)
Scott PletcherSenior DBACommented:
CONVERT(varchar(10), DATEADD(SECOND, 0, SUM(DATEDIFF(ss, [KEY START TIME], [KEY END TIME]))), 8)

If the time could be more than 24 hours,  we'd need to add another calc in front to add "n day(s)" if needed.
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ste5anSenior DeveloperCommented:
E.g.

SELECT  T.create_date ,
        T.modify_date ,
        DATEDIFF(SECOND, T.create_date, T.modify_date) ,
        DATEDIFF(SECOND, T.create_date, T.modify_date) / 60 ,
        DATEDIFF(SECOND, T.create_date, T.modify_date) % 60 ,
        CAST(DATEDIFF(SECOND, T.create_date, T.modify_date) / 60 AS NVARCHAR(255)) + ':'
        + CAST(DATEDIFF(SECOND, T.create_date, T.modify_date) % 60 AS NVARCHAR(255))
FROM    sys.tables T;

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But you better apply such a format in your frontend.
Jimbo99999Author Commented:
Thanks everyone for the responses.  I am trying them out now.
Jimbo99999Author Commented:
Thanks...it is working now!
Jim HornMicrosoft SQL Server Data DudeCommented:
Thanks for the split.  Good luck with your project.  -Jim

btw What was your eventual solution?  Reason I ask is because I have an article in progress on SQL Server date expressions, and am looking for material.
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