如何使用命令行更改MySQL表的外键
问题描述：
如何使用命令行更改MySQL中的现有表，将外键设置为另一个表?
How to alter an existing table in MySQL, setting foreign key to another table, using the command line?
答
您必须删除现有的foreign key并创建另一个.例如这样的
You have to drop existing foreign key and create another one. For example like this:
ALTER TABLE my_table DROP FOREIGN KEY my_key;
ALTER TABLE my_table ADD CONSTRAINT my_key FOREIGN KEY ('some_id')
REFERENCES some_new_table ('some_other_id') ON UPDATE CASCADE ON DELETE CASCADE;