警告：即使没有限制，为什么带有限制子句的语句也不安全？

Question

由于 mysql 错误日志中的一些警告，我有点恼火。示例 1：

[Warning] Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. 
The statement is unsafe because it uses a LIMIT clause. 
This is unsafe because the set of rows included cannot be predicted. 
Statement: UPDATE `table` SET `status` = '1' WHERE `ID` = '15800' LIMIT 1

我的同事写了这些语句，我一直想知道在使用显式 ID 时限制语句的目的。尽管如此，不使用 LIMIT也会出现此警告。
示例 2：

[Warning] Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. 
The statement is unsafe because it uses a LIMIT clause. 
This is unsafe because the set of rows included cannot be predicted. 
Statement: DELETE FROM table WHERE id = 426888

在这种情况下可能有什么问题？

Answer 1

你有 LIMIT 没有 ORDER BY。因此，这是没有意义的。

没有 ORDER BY 的集合没有隐含的顺序。错误消息告诉您：

这是不安全的，因为无法预测包含的行集

您的 DELETE 是否有触发器或带有 LIMIT 的触发器？