Question

Ok, I’ve been searching for two days and have not found anything. I think this is a simple problem, I’m just not able to wrap my head around it for some reason.

Say you have two tables.

Cars

CarID
CarModel

CarTypes

CarTypeID
CarID
TypeOfCar

Example data for Cars:

CarID CarModel
A      Pinto 
B      Corvette
C      Ferrari

Example data for CarTypes:

CarTypeID CarID TypeOfCar
1           A    ChickMagnet
2           A    FourDoor
3           A    GasGuzzler

4           B    SportsCar
5           B    TwoDoor
6           B    GasGuzzler

7           C    GasGuzzler
8           C    TwoDoor
9           C    ChickMagnet 

Car and CarType have a 1 to many relationship (A car can be many different types). I cannot wrap my head around the sql that would be required to show all cars that are a “ChickMagnet” AND a “GAS Guzzler”

Result Set Desired:

CarID CarModel
A     Pinto
C     Ferrari

Any help would be greatly appreciated. I’m using SQL Server. I can do it using Like and Text searches but would like to avoid that.

Answer 1

SELECT c.CarID, c.CarModel
FROM Cars c
INNER JOIN CarTypes ct
ON c.CarID = ct.CarID
WHERE ct.TypeOfCar IN ('ChickMagnet', 'GasGuzzler')
GROUP BY c.CarID, c.CarModel
HAVING COUNT(DISTINCT ct.TypeOfCar) = 2