Hello
PostgreSQL hasn't a timediff function and hasn't a session variables.
You can see how can be implemented this function in pg
http://okbob.blogspot.com/2009/08/mysql-functions-for-postgresql.html.
If you can compare values from different rows, you have to have a pg
>= 8.4 with window functions or you have to use a stored procedure.
http://www.postgresql.org/docs/8.4/static/functions-window.html
Regards
Pavel Stehule
2010/12/2 franrtorres77 <franrtorres77@gmail.com>:
>
> Hello
>
> I have the next query in mysql to get the time difference from two rows, but
> I would like to implement it in postgres, but I'm getting some errors when I
> try to query it.
>
> select speed,mobile,date,
> timediff(@nexttime,date) as tdiff2, (@nexttime:=date) as Next
> from positions
> where speed=0 and mobile = 1883 and date >(now() - interval 2 hour)
>
> I have changed the last part to: (now() - interval '2 hours') but I go on
> getting another error in the Timediff command.
>
> What I want to do is something like this:
>
> 14-12-2010 20:25:40
> 14-12-2010 20:26:45
>
> So, the result would be: the substract of both dates to get how much time
> have spent from the last date
> , so it will result 00:01:05 minutes
>
> Can anyone help me please?
>
> Best regards.
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