update vs4tar set tarncreditusebegin=0 where tarncreditusebegin is null
update vs4tar2 set tar2creditusebegin=0 where tar2creditusebegin is null
update vs4tap set tapncreditusebegin=0 where tapncreditusebegin is null
update vs4tap2 set tap2creditusebegin=0 where tap2creditusebegin is null