摘要:
Pig: 1. 内连接: join_table = join table1 by col1, join table2 by col2 2. 外连接: 左外连接:join_table = join table1 by col1 left outer, join table2 by col2 其中out 阅读全文
posted @ 2015-06-02 18:11
lihui1625
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