Question

I would like to do the following query in MySQL:

SELECT DINSTINCT cstc.car_id FROM cars
    JOIN customer_cars cstc ON cstc.age =  student_cars.age

Where:

cars table has columns: car_id, name,…

customer_cars table has columns: car_id, age

student_cars table has columns: car_id, age

I know the query syntax is wrong because the student_cars table can not be recognized in this query (MySQL raise error).

(Basically, I would like to use the query to find out all car ids where customer_cars age equal to student_cars age)

So, how can I modify the query to make it working?

Answer 1

If you got you right, then that’s it (unverified):

select distinct c.car_id 
from cars c
inner join customer_cars cc on c.car_id = cc.car_id
inner join student_cars sc on c.car_id = sc.car_id
where cc.age = sc.age