count duplicate users and store in db - sql (See related posts)

// count duplicate users and store in db

// count users with filter
select Count(surname+firstname) as duplicates, surname, firstname
from c_contact
where show_record=1
group by surname, firstname
having Count(surname+firstname) > 1
order by duplicates, surname, firstname

// original code
SELECT column,COUNT(*) c 
FROM table
GROUP BY column 
HAVING COUNT(*) > 1

//update code
update c_contact
set duplicates = dbo.func_get_duplicates(surname, firstname)