多好的办法否定子查询

Question

我有这样定义了几桌：

CREATE TABLE `member` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT, 
    ... 
) 

CREATE TABLE `members_to_delete` (
    `id` bigint(20), 
    ... 
) 

CREATE TABLE `message` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT, 
    `sender_id` bigint(20) NOT NULL, 
    `recipient_id` bigint(20) DEFAULT NULL, 
    ... 
    CONSTRAINT `_FK1` FOREIGN KEY (`sender_id`) REFERENCES `member` (`id`), 
    CONSTRAINT `_FK2` FOREIGN KEY (`recipient_id`) REFERENCES `member` (`id`) 
) 

的members_to_delete表包含成员的子集。

只有在members_to_delete表中既不存在sender_id也不存在recipient_id时，才想选择（并最终删除）消息表中的所有行。所以，我想出了这个丑陋的查询：

SELECT id FROM message WHERE sender_id NOT IN (SELECT id FROM members_to_delete) 
AND recipient_id NOT IN (SELECT id FROM members_to_delete); 

我想一定有写这个查询一种更好的方式，但我不知道它是什么。什么是写这种查询的更有效的方法？

Answer 1

对于多列，您可以使用Return row only if value doesn't exist中的技术。

SELECT m.id 
FROM message AS m 
LEFT JOIN members_to_delete AS d 
ON d.id IN (m.sender_id, m.recipient_id) 
WHERE d.id IS NULL