How to Add, Show, and Drop MySQL Foreign Keys
原文英文，约1600词，阅读约需6分钟。发表于：。A key is typically defined as a column or a group of columns that are used to uniquely locate table records in relational databases (including MySQL, of course). And now that we've covered MySQL primary keys on our blog, it's time to give you a similarly handy guide on foreign keys. The post How to Add, Show, and Drop MySQL Foreign Keys appeared first on Devart Blog.
MySQL外键用于定位表记录的列或列组，维护引用完整性，提高查询性能。定义外键约束的语法包括引用表和列、删除和更新操作。可以通过创建新表或修改现有表来添加外键。可以使用SELECT语句查看外键约束，并使用ALTER TABLE语句删除外键。禁用外键检查需谨慎，以避免数据完整性问题。
