Left [Outer] Join without Intersection to get count - tsql

Question

I have the following schema
I wanted to get all cars along with number of models for each car and number of remaining colors for each car.
I was able to get number of models but i am not able to get number of remaining colors for each car. I know i have to do Left [Outer] Join without Intersection. But its not working
I may also have model which does not have any colors. In such case there wont be any entry in ModelColors table
select
c.CarID,
c.CarName,
T1.[Num Of Models],
T2.[Remaining Colors]
from Cars c
LEFT JOIN
(
SELECT m.CarID, COUNT(1) AS 'Num Of Models'
FROM Models m
GROUP BY m.CarID
) AS T1 ON T1.CarID = c.CarID
LEFT JOIN
(
SELECT m1.CarID, COUNT(1) AS 'Remaining Colors'
FROM Colors col
LEFT JOIN ModelColors mc on mc.ColorID = col.ColorID
LEFT JOIN Models m1 on m1.ModelID = mc.ModelID
WHERE mc.ColorID IS NULL
GROUP BY m1.CarID
) AS T2 ON T2.CarID = c.CarID

Answer 1

Your from/join clause in the second derived table (T2) is wrong.
You should use Models and ModelColors only:
SELECT m1.CarID, COUNT(1) AS 'Remaining Colors'
FROM Models m
LEFT JOIN ModelColors mc
ON m.ModelID = mc.ModelID
The entire query should look like this:
SELECT
c.CarID,
c.CarName,
T1.[Num Of Models],
T2.[Remaining Colors]
FROM Cars c
LEFT JOIN
(
SELECT m.CarID, COUNT(1) AS 'Num Of Models'
FROM Models m
GROUP BY m.CarID
) AS T1 ON T1.CarID = c.CarID
LEFT JOIN
(
SELECT m1.CarID, COUNT(1) AS 'Remaining Colors'
FROM Models m
LEFT JOIN ModelColors mc
ON m.ModelID = mc.ModelID
) AS T2 ON T2.CarID = c.CarID
Since you only want to count the colors, you don't need the Colors table at all for this query.