关闭外键检查 ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails
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由于连个表之间有外键制约，所以无法删除
可以通过关闭数据库的外键检查功能来解决该问题，
mysql> SET FOREIGN_KEY_CHECKS=0;
之后再将外键检查功能打开
mysql> SET FOREIGN_KEY_CHECKS=1;
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