ALTER trigger tr_return_quan_rest after delete on
DBA.crgd
referencing old as deleted
for each row begin
  declare @dba_quan integer;
  declare @dba_id_crga unsigned bigint;
  set @dba_id_crga=(select id_crga from deleted);
  set @dba_quan=(select quan from deleted);
  update dba.crga.quan_rest set
    dba.crga.quan_rest = dba.crga.quan_rest+@dba_quan where
    dba.crga.id_crga = @dba_id_crga
end