Find groups with matching rows

Question

I have a table of people (CarOwners) and the types of cars they own

+-------+-------+
| Name  | Model |
+-------+-------+
| Bob   | Camry |
| Bo         


        

Answer 1

try this,i think it is much easier and short code with just one partition function.

    declare @t table(Name varchar(50),Model varchar(50))
    insert into @t values
    ('Bob','Camry')
    ,('Bob','Civic')
    ,('Bob','Prius')
    ,('Kevin','Civic')
    ,('Kevin','Focus')
    ,('Mark','Civic')
    ,('Lisa','Focus')
    ,('Lisa','Civic')

    declare @input varchar(50)='Lisa'

    ;with 
CTE1 AS
(
select name,model,ROW_NUMBER()over( order by name) rn
 from @t
where name=@input
)
,cte2 as
(
select t.name,t.Model
,ROW_NUMBER()over(partition by t.name order by t.name) rn3
from @t t 
inner JOIN
cte1    c on t.Model=c.model 
where   t.Name !=@input
)
select * from cte2 c
where exists(select rn3 from cte2 c1 
where c1.name=c.name and c1.rn3=(select max(rn) from cte1)
)