Ok Neil Coe !!

thank you very much!!!!

SELECT COUNT(marq) FROM car WHERE car.id_car IN (SELECT MAX(id_car) FROM car GROUP BY marq)

the result is 3

So my problem is solved.

See you soon,

First thanks to answer me.

Then vehicule is a mistake, the right table's name is "car" and i really try the queries with car.

I try:

SELECT marq, COUNT(marq) AS Marqs FROM car GROUP...