Sorry for the horrible analogous DB
one to many relationship between keg and can. a single keg could fillReference:: Sikh Philosophy Network http://www.sikhphilosophy.net/information-technology/11447-calculate-field-based-many-side-field.htmlReference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=11447
"keg" has fields originial volume and current volume
I would like the current volume to be the amount left in the keg based
on the amount poured into individual cans.
keg.currentvolume = keg.originalvolume - (total volume of cans from
hope this is enough info..