[thelist] sql query for sum of timediff

[Phil Turmel]

Canfield, Joel wrote:
>>(Not tested...)
> 
> 
> works; see previous response to matt
> 
> thanks phil
> 
> joel

There is a slight difference... My suggestion doesn't blow up if a call 
crosses midnight.

Of course, if you want to count only the time of such calls that occur 
during the requested time period, you've more complicated boundary 
checking to do.

Phil