Error adding an index to a view - sql

Question

I have 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 am getting an error:
Cannot create index because its select list does not use the correct usage of COUNT_BIG(). Consider adding COUNT_BIG(*) to the select.
Please help me solve this issue.

Answer 1

The error tells you exactly what you have to do - add COUNT_BIG(*) to your select list.
From Creating Indexed Views:
If GROUP BY is specified, the view
select list must contain a
COUNT_BIG(*) expression, and the view
definition 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)