SQL Server 的未来版本中将删除 INDEXKEY_PROPERTY。避免在新的开发工作中使用此功能，并计划修改当前使用此功能的应用程序。将改用 sys.index_columns。
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English version
INDEXKEY_PROPERTY will be removed in a future version of SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use the feature. Use sys.index_columns instead.
SQL Server