MySQL左联接未显示

Question

select e.MAT from historico as e
right join alunos as a
on e.MAT = a.MAT

我刚给我第一列“ historico”，我做错什么了吗？我是初学者

  

在此处输入代码

Answer 1

尝试一下：

SELECT *
FROM historico e
RIGHT JOIN alunos a ON e.MAT = a.MAT