Hive 之 map join 和 left semi join 區別

上一篇hive 常見join 從原理上講解了他們的區別，這篇文章通過例子來區別。   0 Data Prepare create table test.student as select 1 as id, 'jack' as name union all select 2 as id, 'jack' as name union all select 3 as id, 'jerry' as name

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