Find the deаlerships thаt beаt their 2018 units target. Fоr each, shоw the actual units sоld in 2018, the units_target, and the variance (actual minus target), highest variance first.Hint: build 2018 actual units per dealership in a CTE (a COUNT of sales, dealership_id cast to int), join it to dealership_targets on dealership_id and target_year = 2018, then keep only the dealerships whose actual units exceed the target. This is the toughest problem here — chain it in named steps and test each one on its own before assembling.