mysql 刪除外鍵約束

查看創建數據庫語句
show create table table_name;

查詢schema中所有外鍵名稱然后拼接生成刪除語句，再執行。
SELECT CONCAT('ALTER TABLE ',TABLE_SCHEMA,'.',TABLE_NAME,' DROP FOREIGN KEY ',CONSTRAINT_NAME,' ;')
FROM information_schema.TABLE_CONSTRAINTS c
WHERE c.TABLE_SCHEMA='db_name' AND c.CONSTRAINT_TYPE='FOREIGN KEY';

刪除表約束

alter table table_name drop foreign key FKstne13dqw7l76ib6cr6ytwl7v;
commit;

參數配置

SET FOREIGN_KEY_CHECKS = 0;
SET GLOBAL FOREIGN_KEY_CHECKS = 0;

查看結果
SELECT @@FOREIGN_KEY_CHECKS;