如果报错信息是“Cannot drop index ‘index_name’: needed in a foreign key constraint”,我们需要先删除与该唯一索引相关的外键约束,再删除唯一索引。删除外键约束的 SQL 语句如下: ALTERTABLEtable_nameDROPFOREIGNKEYforeign_key_name; 1. 解决方案二:删除主键约束 如果报错信息是“Cannot drop index ‘index_na...
当我们尝试删除一个表中的唯一索引时,可能会遇到以下错误: ERROR 1553 (HY000): Cannot drop index 'index_name': needed in a foreign key constraint 1. 这是因为唯一索引可能在其他地方被引用,比如在一个外键约束中。删除唯一索引会破坏这些约束,导致数据库的一致性受到影响。 解决方法 方法一:先删除外键约束...
1、利用alter table语句删除,语法为“alter table 数据表名 drop index 要删除的索引名;”; 2、利用drop index语句删除,语法为“drop index 要删除的索引名 on 数据表名;”。 来源:https://www.php.cn/mysql-tutorials-491947.html
错误信息:Cannot drop index 'energy_type_id': needed in a foreign key constraint 创建device表的信息 1 2 3 4 5 6 7 8 9 CREATE TABLE `device` ( `id`int(11) NOT NULL AUTO_INCREMENT, `name`char(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `device_type_id`int(16) NOT...
Bug #95605“Cannot drop index ... needed in a foreign key constraint” without a foreign key Submitted:3 Jun 2019 0:45Modified:3 Jun 2019 19:42 Reporter:Victor PortonEmail Updates: Status:DuplicateImpact on me: None Category:MySQL Server: DDLSeverity:S3 (Non-critical) ...
(`id`) ON DELETE NO ACTION ON UPDATE NO ACTION ) ENGINE=ndbcluster; alter table image_members drop index `ix_image_members_image_id_member`; ERROR 1553 (HY000): Cannot drop index 'ix_image_members_image_id_member': needed in a foreign key constraint Is this MySQL Cluster specific ...
DECLARE EXIT HANDLER FOR 1532 SELECT "HY000 (ER_DROP_INDEX_FK) Cannot drop index '%s" as 'ERROR_NO SQLSTATE'; DECLARE EXIT HANDLER FOR 1533 SELECT "HY000 (ER_CANT_WRITE_LOCK_LOG_TABLE) You can't write-lock a log table. Only read access is possible." as 'ERROR_NO SQLSTATE'; ...
1、要从表中删除现有索引,可使用DROP INDEX语句。 语法 代码语言:javascript 复制 DROPINDEXindex_nameONtable_name 2、想删除的索引字段名在drop index语法后。表名是要删除字段所在的表。 实例 3、删除名称为idx_cust_name的索引。 其SQL语句为: 代码语言:javascript ...
Ramsundar的导师是斯坦福大学教授Vijay Pande，硅谷风投a16z知名成员。 作者 | Bharath Ramsundar 编译 | ...
Cannot drop table Posted by:John Doe Date: July 06, 2021 07:01AM Hi, I've upgrade from Mysql 5.7 to 8.x and for some reason I managed to break a database. When trying to restore the database - I want to DROP the old one (ab_mydatabase)...