This category of overhead includes CHECK constraint verification and foreign key constraint (referential integrity (ri)) verification.
这一类的开销包括检查约束验证和外键约束(参照完整性(RI))验证。
A Foreign key constraint allows you to define referential integrity between a parent and child table.
外键约束允许您定义父表和子表之间的引用完整性。
Delete a foreign key constraint when you want to remove the requirement to enforce referential integrity.
如果想要移除对强制引用完整性的要求，则可删除外键约束。
Give you the option to implement referential integrity between parent and child tables by creating a foreign key constraint.
允许您选择通过创建外键约束来实现父表和子表之间的引用完整性。
A foreign key constraint can implement referential integrity between parent and child tables.
外部索引键条件约束可于父资料表和子资料表之间，实作参考完整性。
A foreign key constraint allows you to define referential integrity between a parent and child table.
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.
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。
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