updateing records in join select

Greetings all,

i need to present data from a join select on 2 tables and update data on one of the tables acording to user input,

i was told i need to hold 2 datasets one for the full join and the other that holds the table i wish to change (need to change records on one table only)
and then using adapter to update the dataset

do i realy need 2 datasets to do that?  is there no easyer way to update records ?

do i need 2 dataadapters one for each dataset ?

p.s. users change records while browsing the data back and forward

Thanks