如果违反了您在触发器中定义的业务规则，就可以使用signal语句来抛出一个错误条件信号。

You can use a SIGNAL statement to raise an error condition if the business rule defined in your trigger is violated.

youdao

如果违反了您在触发器中定义的业务规则，就可以使用signal语句来抛出一个错误条件信号。

You can use a SIGNAL statement to raise an error condition if the business rule defined in your trigger is violated.

youdao