Hive的on不支援非等值連線解決，不支援or

--oracle

select 
a.*,
b.id asb_id,
b.class as b_class
from lpx_test_a a
left outer join lpx_test_b b
on (a.id = b.id and a.class < b.class);

--hive

select a.*,
case when a.class < b.class then b.idend as b_id,
case when a.class < b.class then   b.class end as b_class
from lpx_test_a a
left outer join lpx_test_b b
on (a.id = b.id)；

select 

* from a
left join b on a.id=b.id and a.id2=b.id2
where a.starttime<= b.time and b.time < a.endtime
select * 
from a
left join b on a.id=b.id and a.id2=b.id2
where a.starttime<= b.time and b.time < a.endtime
union all

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