Error adding index to view

Question

I created a view using the following code

CREATE VIEW dbo.two_weeks_performance WITH SCHEMABINDING
AS 
  SELECT dbo.day_dim.date_time AS Date, 
         dbo.order_dim.quantity AS Target_Acheived
    FROM dbo.day_dim 
    JOIN dbo.order_fact ON dbo.day_dim.day_id = dbo.order_fact.day_id 
    JOIN dbo.branch_dim ON dbo.order_fact.branch_id = dbo.branch_dim.branch_id 
    JOIN dbo.order_dim ON dbo.order_fact.order_id = dbo.order_dim.order_id   
GROUP BY dbo.order_dim.quantity, dbo.day_dim.date_time` 

Now when I use:

CREATE UNIQUE CLUSTERED INDEX two_weeks_performance_I ON two_weeks_performance (Date)

I get an error message:

It is not possible to create an index because its selection list does not use the correct use of COUNT_BIG (). Try adding COUNT_BIG (*) to the selection.

Please help me solve this problem.

Answer 1

The error tells you exactly what you should do - add COUNT_BIG (*) to your selection list.

From Creating Indexed Views :

If GROUP BY is specified, the selection list view must contain COUNT_BIG (*) and the definition view cannot specify HAVING, ROLLUP, CUBE, or GROUPING SETS.

CREATE VIEW dbo.two_weeks_performance WITH SCHEMABINDING
AS 
  SELECT dbo.day_dim.date_time AS Date, 
         dbo.order_dim.quantity AS Target_Acheived,
         COUNT_BIG(*) as Cnt 
    FROM dbo.day_dim 
    JOIN dbo.order_fact ON dbo.day_dim.day_id = dbo.order_fact.day_id 
    JOIN dbo.branch_dim ON dbo.order_fact.branch_id = dbo.branch_dim.branch_id 
    JOIN dbo.order_dim ON dbo.order_fact.order_id = dbo.order_dim.order_id   
GROUP BY dbo.order_dim.quantity, dbo.day_dim.date_time
GO
CREATE UNIQUE CLUSTERED INDEX two_weeks_performance_I ON two_weeks_performance (Date)