filter a view with date - sql-server

Question

I have made a view in order to analyze a specific subject with PowerBI(I can't use other program). In My case the dataBase is according to the following ERD:
The ERD
I've created the following view:
CREATE VIEW sales_based_foodstyless AS
(
SELECT food_style,
total_quantities=Sum(quantity),
average_dish_price=Avg(d.price),
total _revenue=sum(quantity*price),
orders_amount=count(DISTINCT o.orderid),
total_vendors_operating=count( v.vendorid)
FROM vendors AS v
JOIN food_style AS fs
ON fs.vendorid=v.vendorid
JOIN dishes AS d
ON v.vendorid=d.vendorid
JOIN dish_quantities AS dq
ON d.vendorid=dq.vendorid
JOIN orders AS o
ON dq.orderid=o.orderid
GROUP BY food_style
)
I want in the PowerBI to filter the data by date which is to be found as Order_Date of the joined table in the select statement of the view. however I cannot managed to do it.
Help Please

Answer 1

You can add a filter for example
CREATE VIEW sales_based_foodstyless AS
(
SELECT
food_style,
total_quantities=Sum(quantity),
average_dish_price=Avg(d.price),
total _revenue=sum(quantity*price),
orders_amount=count(DISTINCT o.orderid),
total_vendors_operating=count( v.vendorid)
FROM vendors AS v
JOIN food_style AS fs ON fs.vendorid=v.vendorid
JOIN dishes AS d ON v.vendorid=d.vendorid
JOIN dish_quantities AS dq ON d.vendorid=dq.vendorid
JOIN orders AS o ON dq.orderid=o.orderid
WHERE YEAR(order_date) = 2018
GROUP BY food_style
)
However, if you want to do this dynamically you would have to use a stored procedure or parameterized view.

Answer 2

You can do this with a table-valued function:
CREATE FUNCTION fSelectSalesBasedFoodstyles (
#StartDate DATE
, #EndDate DATE
)
RETURNS TABLE
AS
RETURN
SELECT food_style,
total_quantities=Sum(quantity),
average_dish_price=Avg(d.price),
total _revenue=sum(quantity*price),
orders_amount=count(DISTINCT o.orderid),
total_vendors_operating=count( v.vendorid) ,
order_date
FROM vendors AS v
JOIN food_style AS fs
ON fs.vendorid=v.vendorid
JOIN dishes AS d
ON v.vendorid=d.vendorid
JOIN dish_quantities AS dq
ON d.vendorid=dq.vendorid
JOIN orders AS o
ON dq.orderid=o.orderid
-- CAST only necessary if OrderDate is a DATETIME:
WHERE CAST(o.order_date AS DATE) >= #StartDate
AND CAST(o.order_date AS DATE) <= #EndDate
GROUP BY food_style
GO