我該怎麼辦相反的鍵連接或反向輸出相反

Question

如何使用SQL加入讓不常見

這是我表一個

+------+----------+ 
    | id | contact | 
    +------+----------+ 
    | 4 | 1111-111 | 
    | 5 | 2222-222 | 
    | 6 | 3333-333 | 
    | 7 | 4444-444 | 
    | 8 | 5555-555 | 
    +------+----------+ 

這是我的表B中

+------+----------+ 
    | id | Name | 
    +------+----------+ 
    | 1 | Juan  | 
    | 2 | Carlo | 
    | 3 | Mark  | 
    | 4 | Joseph | 
    | 5 | May  | 
    +------+----------+ 

這是我的查詢=>選擇的B內部連接A，其中B.id = A.id

+----------+ 
    | Name | 
    +----------+ 
    | Joseph | 
    | May  | 
    +----------+ 

名

但是我預期的輸出應該是這樣的：

+----------+ 
    | Name | 
    +----------+ 
    | Juan  | 
    | Carlo | 
    | Mark  | 
    +----------+ 

Answer 1

使用left join

Select name 
from B 
left join A ON B.id = A.id 
where A.id is null 

見this explanation of joins