Question

I have three tables kinda like the example below:

TABLE CARS

carId   carName
-----   --------
1       a
2       a
3       b
4       b
5       b
6       c
7       d
8       e
9       f
10      g

TABLE CAR NAMES

nameId  carName
------  -------
1       a
2       b
3       c
4       d
5       e
6       f
7       g

TABLE CAR ATTRIBUTES

nameId  attribute
------  ---------
1       FAST
1       SMALL
1       SHINY
2       BIG
2       SLOW
3       EXPENSIVE
4       SHINY
5       FAST
5       SMALL
6       FAST
7       SMALL

I have been trying to put together a query to get the carId where it has attributes of both FAST and SMALL, but have been having no luck. What is the best way to do this?

In this example the result would be carID 1 and carName a where attribute = SMALL and attribute = FAST

Answer 1

Looking for something like this?
(untested)

select a.carId
  from cars        a
  join car_names   b using(carName)
  join car_attribs c using(nameId)
 where c.attribute in('SMALL', 'FAST')
 group 
    by a.carId
having count(distinct c.attribute) = 2;