Result
d . dealer             | d . make | d . model  | d . year | d . ad_price | diff
----------            ------------------- ---------------------------
'Jasons cars'        | 'Ford'    | 'Mustang'  | 2015        | 26000             | 4000
'Local SUVs'          | 'Ford'    | 'Explorer' | 2016        | 20000             | 1800
'Roys dealership' | 'Honda'  | 'Civic'      | 2016        | 15300             | 800 
'Local SUVs'          | 'Honda'  | 'CRV'          | 2016        | 19000             | 500 
'Jasons cars'        | 'Ford'    | 'Focus'      | 2016        | 12000             | 200 
'Roys dealership' | 'Ford'    | 'Focus'      | 2015        | 11900             | 100 

-------Compile time: 0.016, Execution time: 0.006