sql query for considering the difference in capitalization

Hi All,

I have a table consisting a list of students, which has two fields , serialno and name.

I need a list of all records in this table where the SerialNo  field is the same but the name  are not the same.

So for instance:
select SerialNo      , firstname from school where SerialNo      = '1'

Returns:
SerialNo      name
1            sHamjith
1            shamjith
1            Shamjith

In this case the query should return serialno=“1” since the name in the first row with “1” does not match the firstname in the second row.

I tried using the following query, but it only works if the names are completely different.  It does not work when the names only differ by capitalization:

select SerialNo, count(SerialNo) 
from school
group by SerialNo
having 
       count(SerialNo) > 1 AND
       min(name) <> max(name)
order by count(SerialNo) desc

Samproo