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select s.name,s.course,s.grade from student as s inner join

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select s.name,s.course,s.grade from student as s inner join student as t on s.name=t.name
where s.courset.course 我想知道这段代码最后两句是什么意思?为什么又把student as t .
select s.name,s.course,s.grade from student as s inner join
本表与本表链接查询嘛
再问： 都是在一个表里。为啥前面AS s 后面又要AS t 呢？
再答： 这个是标识嘛，你看两个表都是一样的，如果用你个字段，它是不晓得你用的那个字段的，s.什么，t.什么，就可以区别了撒。主要是看 s.name=t.name，你难道可以写成name=name么？
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