You could use the UNIX_TIMESTAMP() function to easily determine
the difference in seconds between the two dates.
select UNIX_TIMESTAMP( Datetime_A ) ...
and the do the time_a - time_b thing. there might be a simple query that
will work as well, but I don't know the mysql date queries that good :)
.. Atle
On Tue, 20 Feb 2001, Duncan Hudson wrote:
> I have a table that contains two datetime columns, and I need to determine
> the time between the two dates. So, what I've been doing is just
> subtracting what I know is the later date from the earlier date. But that's
> obviously not the way to do it as my results don't relate to anything.
> Here's what my data looks like:
>
> Datetime_A Datetime_B (Datetime_A - Datetime_B)
> 2001-02-20 14:09:38 2001-02-20 14:20:43 18.416666666667
> 2001-02-20 14:14:45 2001-02-20 14:30:35 26.5
> 2001-02-20 14:22:03 2001-02-20 14:28:14 10.183333333333
>
> The differences should be 11 minutes 5 seconds, 15 minutes 50 seconds and 6
> minutes 11 seconds respectively - but that's not what I'm getting. As I'm
> obviously doing this wrong, what is the correct means of determining the
> time difference between two datetime fields? Thanks in advance,
>
>
> Dunc.
>
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