Cannot create %S_MSG on view ‘%.*ls’. It does not have a unique clustered index.

Error Message:
Msg 1940, Level 16, State 1, Line 2
Cannot create %S_MSG on view ‘%.*ls’. It does not have a unique clustered index.

Severity level:
16.

Description:
This error message appears when you try to create a nonclustered index on a view.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Error of the Severity Level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. Only clustered indexes can be created on a view.

Versions:
All versions of SQL Server (beginning with SQL Server 2000).

Example(s):
USE Northwind;
GO

SET NUMERIC_ROUNDABORT OFF;
SET ANSI_PADDING,
    ANSI_WARNINGS,
    CONCAT_NULL_YIELDS_NULL,
    ARITHABORT,
    QUOTED_IDENTIFIER,
    ANSI_NULLS ON;
GO

IF OBJECT_ID (‘dbo.MyOrderView’, ‘View’) > 0
   DROP VIEW dbo.MyOrderView;
GO
CREATE VIEW dbo.MyOrderView
WITH SCHEMABINDING
AS
SELECT SUM(UnitPrice*Quantity*(1.00-Discount)) AS Revenue,
    OrderDate, ProductID, COUNT_BIG(*) AS MyCount
  FROM dbo.[Order Details] AS od
  JOIN dbo.Orders AS o
    ON od.OrderID = o.OrderID
 GROUP BY OrderDate, ProductID;
GO

CREATE UNIQUE NONCLUSTERED INDEX cix_MyOrderView
    ON dbo.MyOrderView (OrderDate, ProductID);
GO

Remarks:
In the above example we try to create a nonclustered index on the view MyOrderView. This raises the error.




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