举例子：
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hive> select * from zz0; 111111 222222 888888 hive> select * from zz1; 111111 333333 444444 888888 hive> select * from zz0 join zz1 on zz0.uid = zz1.uid; 111111 111111 888888 888888 hive> select * from zz0 left outer join zz1 on zz0.uid = zz1.uid; 111111 111111 222222 NULL 888888 888888 hive> select * from zz0 right outer join zz1 on zz0.uid = zz1.uid; NULL 111111 111111 NULL 333333 NULL 444444 888888 888888 hive> select * from zz0 full outer join zz1 on zz0.uid = zz1.uid; NULL 111111 111111 222222 NULL NULL 333333 NULL 444444 888888 888888 hive> select * from zz0 left semi join zz1 on zz0.uid = zz1.uid; 111111 111111 888888 888888 |