How can I count unique pairs of values in SQL?

Question

With the following sql statement I can get all unique values with their counts for a given column:

select column, count(column) as count 
         from table          


        

Answer 1

SELECT first_name, last_name, COUNT(distinct last_name) AS c
FROM ttable
GROUP BY first_name, last_name
HAVING c > 999
ORDER BY c DESC 

Adding distinct will do it in MYSQL. Thanks