answer plz..

hi cud u plz help me in getting answers for these queries?

events of selection screen?

how to validate bulk of fields from selection screen at a time?

how to retrieve the data from two database tables into one internal table which are not having any common field in both tables, using only one select statement?

marks wud rewarded for the right answwers..plz dont give any likns..

regards

toufeeqh