不推荐使用此索引选项语法。SQL Server 的未来版本中将删除不推荐使用的关系索引选项的语法结构。避免在新的开发工作中使用此语法结构，并计划修改当前使用它的应用程序。
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English version
Usage of deprecated index option syntax. The deprecated relational index option syntax structure will be removed in a future version of SQL Server. Avoid using this syntax structure in new development work, and plan to modify applications that currently use the feature.
SQL Server