如何從3個MySQL表中選擇Name，Name和Name_Chairrr？

Question

這裏是DB的方案。如何從3個MySQL表中選擇Name，Second Name和Name_Chairrr？

SELECT p.Name, p.Second_Name, c.Name_CHAIRRR 
FROM Professors p 
JOIN pchairs pc ON pc.ID_Professor = p.ID_professor 
JOIN Chairs c ON c.ID_chair = pc.ID_Chair 

Answer 1

你必須加入表一起，使用別名。試試這個

SELECT p.Name, p.Second_Name, c.Name_CHAIRRR 
FROM Professors p 
JOIN pchairs pc ON pc.ID_Professor = p.ID_professor 
JOIN Chairs c ON c.ID_chair = pc.ID_Chair 

Answer 2

我以爲你在找這個

select 
    p.name, 
    p.second_name, 
    c.name_chairrr 
from 
    professors p 
inner join 
    pchairs pc 
on 
    p.id_professor=pc.id_professor 
inner join 
    chairs c 
on 
    pc.id_chair=c.id_chair