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Join左外连接(Left Outer)概述:
左表与右表结合,取左表全部属性,右表若无则写null;
1、首先,你还是要有两个表:
表1:people
表2:students
2、然后,进行SQL语句操作
select students.s_name,students.s_age,people.p_sex
from students
left join people
on students.s_name=people.p_name
order by students.s_name;
3、结果如下: