hive入门篇
hive> desc mytest;
OK
num int
name string
Time taken: 0.087 seconds
hive> select * from mytest;
OK
NULL NULL
22 world
33 hive
hive> select * from mytest a join mytest b on a.num=b.num;
OK
22 world 22 world
33 hive 33 hive