無法在檢視 "%2" 上建立叢集索引 "%1"，因為檢視參考未知的值 (可為 Null 的運算式的 SUM 彙總)。建議您僅在 SUM. ISNULL() 中參考不可以是 Null 的值，或許會對此有幫助。

Cannot create the clustered index "%1" on view "%2" because the view references an unknown value (SUM aggregate of nullable expression). Consider referencing only non-nullable values in SUM. ISNULL() may be useful for this.