Sum of datetime différence...

Hi,

I would like to know what is the easiest way to add multiple difference of
datetime but show the result in hour and minute something like :

table foo:

start datetime
end datetime

I would like to do :

select sum(end-start) from foo;

but it gives me 3 days 12 hours 23 minutes...etc

I would like to see 84 hours and 23 minutes...

How can I do this?

PS: Is there a way to know which week of the year a current day is in?

Frédéric Boucher
Ed(at)jetumele(dot)com