加入db表

Question

我有2个数据库表：

• 课程

  id|name|teacher_id
  

• 教师

  id|first_name|last_name|email
  

我想在id, name表格中显示courses，在first_name, last_name表格中显示teachers。

我使用full join method：

select name, 
    first_name, 
    last_name 
from courses 
full join teachers on teachers.id = courses.teacher_id;

我收到以下错误：

  

未知栏＆＃39; courses.teachers_id＆＃39;在＆＃39; on条款＆＃39;

Answer 1

试试这个：

select name, first_name, last_name from courses 
inner  join 
teachers on teachers.id = courses.teacher_id;

Answer 2

您在MySQL上没有FULL JOINS，但实现如下：

如果您打算 FULL OUTER JOIN ：

select name, first_name, last_name from courses left join teachers on teachers.id = courses.teacher_id;
union all
select name, first_name, last_name from courses right join teachers on teachers.id = courses.teacher_id;

INNER JOIN

select name, first_name, last_name from courses left join teachers on teachers.id = courses.teacher_id;