How can I change NULL to 0 when getting a single value from a SQL function?

Question

I have a query that counts the price of all items between two dates. Here is the select statement:

SELECT SUM(Price) AS TotalPrice 
FROM Inventory
WHERE (DateAdd         


        

Answer 1

SELECT COALESCE(
    (SELECT SUM(Price) AS TotalPrice 
    FROM Inventory
    WHERE (DateAdded BETWEEN @StartDate AND @EndDate))
    , 0)

If the table has rows in the response it returns the SUM(Price). If the SUM is NULL or there are no rows it will return 0.

Putting COALESCE(SUM(Price), 0) does NOT work in MSSQL if no rows are found.