外部索引键条件约束可让您在父、子资料表之间定义参考整合性。

A foreign key constraint allows you to define referential integrity between a parent and child table.

youdao

外部索引键条件约束可让您在父、子资料表之间定义参考整合性。

A foreign key constraint allows you to define referential integrity between a parent and child table.

youdao