Interview Question - difference among, left outer join, right outer join, inner join and outer join

read the following two links:
http://www.programmerinterview.com/index.php/database-sql/difference-between-a-left-outer-join-and-right-outer-join/

http://stackoverflow.com/questions/5706437/whats-the-difference-between-inner-join-left-join-right-join-and-full-join

    原文作者:Richardo92
    原文地址: https://www.jianshu.com/p/677de5f05a81
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