1、在tableA与tableB中查询tableA中全部数据和tableB中在tableA中的数据
select * from tableA A left join tableB B on A.key=B.key
2、在tableA中查询排除tableB中数据，剩余的tableA中的数据
select * from tableA A left join tableB B on A.key=B.key where B.key is null
3、查询tableA与tableB中所有的数据
select * from tableA A full outer join tableB B on A.key=B.key
4、查询tableA与tableB两表之外的数据
select * from tableA A full outer join tableB B on A.key=B.key where A.key is null or B.key is null
5、查询tableA与tableB*同的数据
select * from tableA A inner join tableB B on A.key=B.key
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