SQL Server: Trouble with NULL values in a conditional COUNT during GROUP BY
I'm reviewing some code and Quick question that's been bugging me - I'm experimenting with I need some guidance on I'm having trouble with a SQL query in SQL Server 2019 where I want to count the number of orders based on their status, but I need to treat NULL values distinctly. I'm running this query: ```sql SELECT Status, COUNT(CASE WHEN OrderID IS NOT NULL THEN 1 END) AS OrderCount FROM Orders GROUP BY Status; ``` The question arises when I have records with a NULL 'Status'. Instead of excluding those records from the count, the query returns 0, which is not what I expected. I've also tried using `COALESCE` to handle NULLs, but that results in adding an unexpected row for the NULL status: ```sql SELECT COALESCE(Status, 'No Status') AS Status, COUNT(OrderID) AS OrderCount FROM Orders GROUP BY COALESCE(Status, 'No Status'); ``` This gives me a count with a new row for 'No Status', but I'd like to exclude NULL statuses altogether and count only the non-NULL entries under their respective statuses. I've also looked into using `ISNULL` and `NULLIF`, but I keep running into the same scenario. Any insights on how I can count the orders while effectively handling NULL values in my Status column without introducing an additional row for NULLs? I'm particularly focused on maintaining performance since the Orders table holds over a million rows and I need this query to be efficient. Any help would be greatly appreciated! I've been using Sql for about a year now. Thanks in advance! My development environment is Windows 10. Has anyone else encountered this? My development environment is macOS.