sql怎么样合并两个查询结果 横向显示出来？

Question

select * from (select d_roomid,d_type from ROOMPRICE) as a, (select d_roomid,d_personname from REGISTER where REGISTER.D_EXCHANGE='否' and REGISTER.D_STATE='未结帐' ) as b where a.D_ROOMID=b.D_ROOMID这样会让register.d_roomid 显示一样的房间和名字 其实只有8207有其他房间是没信息的

Answer 1

select a.d_roomid,a.d_type,b.d_roomid,b.d_personname from
ROOMPRICE a
left join REGISTER b on b.D_EXCHANGE='否' and b.D_STATE='未结帐'
and a.D_ROOMID=b.D_ROOMID

Answer 2

用左连接即可。