Time diff calculations where date and time are in seperate columns

Posted by pedalpete on Stack Overflow See other posts from Stack Overflow or by pedalpete
Published on 2010-05-03T16:41:05Z Indexed on 2010/05/03 16:48 UTC
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mysql-query

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datetime

I've got a query where I'm trying to get the hours in duration (eg 6.5 hours) between two different times.

In my database, time and date are held in different fields so I can efficiently query on just a startDate, or endDate as I never query specifically on time.

My query looks like this

SELECT COUNT(*), IFNULL(SUM(TIMEDIFF(endTime,startTime)),0) FROM events WHERE user=18

Sometimes an event will go overnight, so the difference between times needs to take into account the differences between the dates as well.

I've been trying

SELECT COUNT(*), IFNULL(SUM(TIMEDIFF(CONCAT(endDate,' ',endTime),CONCAT(startDate,' ',startTime))),0) FROM events WHERE user=18

Unfortunately I only get errors when I do this, and I can't seem to combine the two fields into a single timestamp.

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