本文介绍了MySQL RESTRICT 和无操作的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
RESTRICT
和 NO ACTION
在 MySQL FK 中有什么区别?从文档来看,它们似乎完全相同.是这样吗?如果有,为什么两者都有?
What's the difference in a MySQL FK between RESTRICT
and NO ACTION
? From the doc they seem exactly the same. Is this the case? If so, why have both?
推荐答案
来自 MySQL 文档:https://dev.mysql.com/doc/refman/8.0/en/create-table-foreign-keys.html
From MySQL Documentation: https://dev.mysql.com/doc/refman/8.0/en/create-table-foreign-keys.html
某些数据库系统已延迟检查,并且 NO ACTION
是延迟的查看.在 MySQL 中,外键立即检查约束,所以 NO ACTION
和 RESTRICT
是一样的.
Some database systems have deferred checks, and
NO ACTION
is a deferred check. In MySQL, foreign key constraints are checked immediately, soNO ACTION
is the same asRESTRICT
.
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