DELETE在MySQL

Question

使用子查詢我想下面

SELECT * `members` m 
WHERE NOT EXISTS 
    (SELECT s.mid 
    FROM memberships s 
    WHERE s.mid = m.id); 

轉換爲相當於delete語句。但是，下面的代碼無法正常工作：

DELETE FROM `members` m 
WHERE NOT EXISTS 
    (SELECT s.mid 
    FROM memberships s 
    WHERE s.mid = m.id); 

Answer 1

您可以使用多臺DELETE語法執行外連接的表之間的連接：

DELETE FROM members 
USING members LEFT JOIN memberships ON memberships.mid = members.id 
WHERE memberships.mid IS NULL