请检查MSDN网站的语法。

RESTORE（Transact-SQL） [ ^ ]

Please check MSDN site for the syntax.
RESTORE (Transact-SQL)[^]

>

restore database CorruptDemoDataPurityfrom disk=...

如果这是您实际键入的内容，那么您在数据库名称和 FROM 之间缺少空格：

If that's what you actually typed, then you're missing a space between the database name and the FROM:

restore database CorruptDemoDataPurity from disk=...