SQL Server 的未来版本中将删除 CREATE RULE 和 DROP RULE。避免在新的开发工作中使用 CREATE RULE 和 DROP RULE，并计划修改当前使用它们的应用程序。将改用检查约束，这些检查约束是使用 CREATE TABLE 或 ALTER TABLE 的 CHECK 关键字创建的。

CREATE RULE and DROP RULE will be removed in a future version of SQL Server. Avoid using CREATE RULE and DROP RULE in new development work, and plan to modify applications that currently use them. Use check constraints instead, which are created using the CHECK keyword of CREATE TABLE or ALTER TABLE.