aa表：
bb表：
1.left join
select * from aa left join bb on aa.id =bb.id;
2.left semi join
select * from aa left semi join bb on aa.id =bb.id;
3.left outer join
select * from aa left outer join bb on aa.id =bb.id;
4.right outer join
select * from aa right outer join bb on aa.id =bb.id;
5.join
select * from aa join bb on aa.id =bb.id;
bb表：
1.left join
select * from aa left join bb on aa.id =bb.id;
2.left semi join
select * from aa left semi join bb on aa.id =bb.id;
3.left outer join
select * from aa left outer join bb on aa.id =bb.id;
4.right outer join
select * from aa right outer join bb on aa.id =bb.id;
5.join
select * from aa join bb on aa.id =bb.id;
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/29667072/viewspace-2121138/ ，如需转载，请注明出处，否则将追究法律责任。
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