Adding count(*) from group and cte to variable? - sql-server-2008

Question

The contents of table #sales is basically the most sold car brand per city. This is saying that Toyota was sold the most in Houston and Chicago, etc.
The result of this query (which I know can be better) shows what brands were tied and the amount of times it tied. For example, Chevy tied for 1st place in two cities, Ford tied in one city (Miami), and so on.
How can I add count(*) to the variable based on CarSoldMost? In this case, I would add 2 to #chevy, 1 to #ford, etc?
I was thinking of using a case statement, but it's being used incorrectly.
declare #toyota int = 0
declare #nissan int = 0
declare #chevy int = 0
declare #ford int = 0
declare #sales table
(
city varchar(10),
CarSoldMost varchar(10)
)
insert into #Sales
select 'Chicago', 'Toyota' union
select 'Orlando', 'Nissan' union
select 'miami', 'Ford' union
select 'miami', 'Chevy' union
select 'houston', 'Toyota' union
select 'houston', 'Chevy'
select *From #sales
;with cte as
(
select city
from #sales
group by city
having count(*) > 1
) --select carsoldmost, count(*) from #sales where city in (select city from cte)
group by carsoldmost
select #chevy =
case
when carsoldmost = 'chevy' then #chevy+count(*)
when carsoldmost = 'Ford' then #ford+count(*)
end
from #sales where city in (select city from cte) group by carsoldmost
select #chevy, #ford

Answer 1

The assignments to variables need to be done with separate case expressions:
-- Sample data.
declare #Sales as Table(
City VarChar(10),
CarSoldMost VarChar(10) );
insert into #Sales ( City, CarSoldMost ) values
( 'Chicago', 'Toyota' ),
( 'Orlando', 'Nissan' ),
( 'Miami', 'Ford' ),
( 'Miami', 'Chevy' ),
( 'Houston', 'Toyota' ),
( 'Houston', 'Chevy' );
select * from #Sales;
-- Summary variables.
declare #Chevy int = 0, #Ford int = 0, #Nissan int = 0, #Toyota int = 0;
-- Summary query.
with cte as (
select City
from #Sales
group by City
having Count(*) > 1 )
select
#Chevy += case when CarSoldMost = 'Chevy' then Count(*) else 0 end,
#Ford += case when CarSoldMost = 'Ford' then Count(*) else 0 end,
#Nissan += case when CarSoldMost = 'Nissan' then Count(*) else 0 end,
#Toyota += case when CarSoldMost = 'Toyota' then Count(*) else 0 end
from #Sales
where City in ( select City from cte )
group by CarSoldMost;
-- Display the results.
select #Chevy as 'Chevy', #ford as 'Ford', #Nissan as 'Nissan', #Toyota as 'Toyota';

Answer 2

additional variant to already posted using conditional agregation
-- display result/or replace aliasis by variables to assign values.
select
Chevy = Count(case when CarSoldMost = 'Chevy' then 1 end) ,
Ford = Count(case when CarSoldMost = 'Ford' then 1 end),
Nissan = Count(case when CarSoldMost = 'Nissan' then 1 end),
Toyota = Count(case when CarSoldMost = 'Toyota' then 1 end)
from #Sales as a
Where City in (select City
from #Sales
group by City
having count(City)>1)
testing: