Hello !
I have a table say td with two attributes a and b, both of type time.
All i want to do is to calculate the difference in seconds between this
two time values. The value of b should always be greater then the one of
a.
How can i do this ? Allready tried a lot with all the functions \df
showed me but did´nt got closer....
Help would be highly appriciated !
lG,
John