加入db表

Question

我有2個數據庫表：

• 課程

  id|name|teacher_id 
  

• 教師

  id|first_name|last_name|email 
  

我想從courses表和first_name, last_name從顯示0​​teachers表。

我用full join method：

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

而且我得到以下錯誤：

未知列 '的條款' 在 'courses.teachers_id'

Answer 1

試試這個一個：

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

Answer 2

你沒有完全在MySQL連接，但如下做到這一點：

如果你打算做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; 

對於INNER JOIN

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