select distinct ID from TrainTime order by ID
select Station from TrainTime where S_No='1'order by ID
select Station from TrainTime where D_Time='-' order by ID
怎样将这3句sql语句合成一句。都是在一个表里面。
select distinct ID from TrainTime order by ID
select Station from TrainTime where S_No='1'order by ID
select Station from TrainTime where D_Time='-' order by ID
怎样将这3句sql语句合成一句。都是在一个表里面。