那是主表字段(任务表):
task_id int(10) UNSIGNED No None AUTO_INCREMENT
这是我的外部表字段(url_error_stats 表):
task_id int(10) UNSIGNED No None
url_error_stats 没有提供“关系视图”选项来连接键..为什么?
SQL查询:
ALTER TABLE
url_error_stats
添加外键 (task_id
) 引用aws_backlinks
。tasks
(
task_id
) ON DELETE CASCADE ON UPDATE CASCADE ;
MySQL 说:
1452 - 无法添加或更新子行:外键约束失败 (
aws_backlinks
., CONSTRAINT#sql-6f0_3bd_ibfk_1
FOREIGN KEY (task_id
) REFERENCEStasks
(task_id
) ON DELETE CASCADE ON UPDATE CASCADE)