If the remote tables have restrictions on the data such as check constraints, you can convey these restrictions to the federated server using informational check constraints.
如果远程表在数据上有检查约束，那么可以使用信息检查约束将这些约束传递到联邦服务器。
Check constraints are constraints on table columns that are used to restrict the user to a particular check condition.
检查限制是表的列上的限制，用于将用户限制到特定的检查条件。
If informational check constraints exist on the primary key column, you should explicitly specify informational check constraints on their corresponding foreign key columns. For example.
如果在主键列上存在信息检查约束，那么应该在它们相应的外键列上指定信息检查约束。
Check constraints view a "Allows adding check constraints for a table and its columns."
Check constraints视图—允许添加表及其列的检查约束。
Check constraints view a "Allows adding check constraints for a table and its columns."
Check constraints视图—允许添加表及其列的检查约束。
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