刪除外鍵盤

１.查詢外鍵別名：

mysql> show create table son; +-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | son | CREATE TABLE `son` (`id` int DEFAULT NULL,`name` char(20) DEFAULT NULL,`grade` tinyint DEFAULT NULL,`favourate` varchar(39) DEFAULT NULL,KEY `ffffff_key` (`id`),CONSTRAINT `ffffff_key` FOREIGN KEY (`id`) REFERENCES `father` (`stu_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci | +-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)

2.alter table son drop foreign key ffffff_key;

mysql> alter table son drop foreign key ffffff_key; Query OK, 0 rows affected (0.02 sec) Records: 0 Duplicates: 0 Warnings: 0

接下來可以刪除子表和父表

刪除父表有兩個(gè)方法

(1)刪除子表

(2)刪除子表的外鍵約束。

總結(jié)

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