mysql delete from table 失败

Posted 2020-10-02 懵懂的菜鸟

SET @[email protected]@SQL_MODE, SQL_MODE=‘NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION‘;

TRUNCATE TABLE name
truncate语句，是清空表中的内容，包括自增主键的信息。truncate表后，表的主键就会重新从1开始。

check the manual that corresponds to your mysql server version for the right syntax to yse near ‘-‘ at line 1

[Msg] [Imp] Import table [bridge02]
[Err] [Imp] 1452 - Cannot add or update a child row: a foreign key constraint fails (`mydb`.`bridge02`, CONSTRAINT `TRSD_id2` FOREIGN KEY (`TRSD_id`) REFERENCES `trsd_adr_vli` (`TRSD_id`) ON DELETE NO ACTION ON UPDATE NO ACTION)
[Err] [Imp] INSERT INTO `bridge02` (`TRSD_pos`,`TRSD_id`,`TRCD_id`,`TRED_id`) VALUES (‘20‘,‘11‘,NULL,‘3‘),(‘30‘,‘11‘,NULL,‘21‘),(‘40‘,‘11‘,NULL,‘155‘),(‘0‘,‘0‘,NULL,NULL)
[Msg] [Imp] Processed:5, Added:1, Updated:0, Deleted:0, Errors:4
[Msg] [Imp] Finished - Unsuccessfully

mysql> delete from users_table where id =1;
ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails。。。问题解决
在MySQL在InnoDB中设置了foreign key关联，造成无法更新或删除数据。可以通过设置FOREIGN_KEY_CHECKS变量来避免这种情况。
在命令行中输入：
SET FOREIGN_KEY_CHECKS = 0;
删除完成后设置
SET FOREIGN_KEY_CHECKS = 1;
这样再select发现已经删除成功！

truncate table 表名;
delete from 表名;