MySQL杂谈

原創 一嵩寒溪 2020-06-27 06:22

MySQL会给外键默认加一个索引吗？

参考SHOW INDEX Statement

的确会给外键默认加一个索引。

外键约束

默认创建的外键，子表加入引用父表某一行，那么更新子表的外键列和父表的主键都会
被拒绝。

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