Question

我要删除不存在按表顺序排列的id客户的客户id

DELETE FROM 
    customers a 
WHERE 
    a.id_customers IN(
        SELECT 
            c.id_customers 
        FROM 
            customers c 
        WHERE 
            c.id_customers NOT IN (
                SELECT DISTINCT 
                    o.customer_id 
                FROM orders o
            )
    )

＃1064-您的SQL语法有错误；检查与您的MariaDB服务器版本相对应的手册以获取正确的语法，以在第1行的'a WHERE a.id_customers IN（SELECT c.id_customers FROM客户c WHERE c.id_cust'）附近使用

Answer 1

您可以在以下查询中使用NOT EXISTS

DELETE customers c 
 WHERE NOT EXISTS 
        ( SELECT 0
            FROM orders o 
           WHERE c.id_customers = o.customer_id );

Answer 2

您能尝试一下吗？

DELETE customers a WHERE a.id_customers NOT IN (SELECT id_customers FROM orders GROUP BY id_customers) b

删除ID并使用其他ID删除

2 个答案: