无法在具有子查询的SCHEMABINDING上创建UNIQUE CLUSTERED INDEX

Question

下面是代码：

CREATE VIEW [dbo].[View_GetAllContents] WITH SCHEMABINDING AS
SELECT C.ContentID,
       C.Title,
       C.[Description],
       C.Tags,
       C.Markets,
       C.Formats,
       C.Categories,
       C.IsGlobalSalesResource,
       C.IsActive,
       C.CreatedBy,
       C.CreatedDate,
       C.ModifiedBy,
       STUFF(
               (SELECT ',' + T.TagName
                FROM [dbo].[Tags] T
                WHERE T.IsActive=1
                  AND T.TagID IN
                    (SELECT LTRIM(RTRIM(items))
                     FROM [dbo].[SplitString](C.Tags, ','))
                  FOR XML PATH(''), TYPE).value('.[1]', 'nvarchar(max)'), 1, 2, '') AS TagNames,
       STUFF(
               (SELECT ',' + M.MarketName
                FROM [dbo].[Markets] M
                WHERE M.IsActive=1
                  AND M.MarketID IN
                    (SELECT LTRIM(RTRIM(items))
                     FROM [dbo].[SplitString](C.Markets, ','))
                  FOR XML PATH(''), TYPE).value('.[1]', 'nvarchar(max)'), 1, 2, '') AS MarketNames,
       STUFF(
               (SELECT ',' + F.FormatName
                FROM [dbo].[Formats] F
                WHERE F.IsActive=1
                  AND F.FormatID IN
                    (SELECT LTRIM(RTRIM(items))
                     FROM [dbo].[SplitString](C.Formats, ','))
                  FOR XML PATH(''), TYPE).value('.[1]', 'nvarchar(max)'), 1, 2, '') AS FormatNames,
       STUFF(
               (SELECT ',' + Ca.CategoryName
                FROM [dbo].[Categories] Ca
                WHERE Ca.IsActive=1
                  AND Ca.CategoryID IN
                    (SELECT LTRIM(RTRIM(items))
                     FROM [dbo].[SplitString](C.Categories, ','))
                  FOR XML PATH(''), TYPE).value('.[1]', 'nvarchar(max)'), 1, 2, '') AS CategorieNames,
       STUFF(
               (SELECT '$A$' + cast(A.AttachmentID AS varchar) + '$,$' + cast(A.ActualFileName AS nvarchar(1000))
                FROM [dbo].[Attachments] A
                WHERE A.ContentID=C.ContentID
                  FOR XML PATH(''), TYPE).value('.[1]', 'nvarchar(max)'), 1, 3, '') AS Attachments
FROM [dbo].[Contents] C GO

以下代码错误：

CREATE UNIQUE CLUSTERED INDEX [IX_View_GetAllContents_ContentID] ON [dbo].[View_GetAllContents](ContentID);

GO

例外： 无法在视图“ SM_SalesWarehouse.dbo.View_GetAllContents”上创建索引，因为它包含一个或多个子查询。考虑将视图更改为仅使用联接而不是子查询。另外，请考虑不要为此视图编制索引。