constraint

V-rep学习笔记：Geometric Constraint Solver（几何约束求解）

　　The geometric constraint solver is slower and less pr […]

Mysql – 删除表时出现： Cannot delete or update a parent row: a foreign key constraint fails

现象 MySQL在删除一张表时出现 ERROR 1217 (23000): Cannot delete or […]

MySQL设置外键报错 #1452 – Cannot add or update a child row: a foreign key constraint fails 解决方法

　　MySQL数据库，当我尝试在A表中设置B表的主键为外键时，报出错误：#1452 – Canno […]