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CREATE TABLE t (id int, country varchar(6), year int) ; INSERT INTO t (id, country, year) VALUES (1, 'USA', 2010), (2, 'Mexico', 2010), (3, 'USA', 2011), (4, 'India', 2011), (5, 'Japan', 2011) ;
5 rows affected
select distinct year ,count(country) over(order by year) as cnt from ( select * ,row_number() over(partition by country order by year) as rn from t ) t where rn = 1
year
cnt
2010
2
2011
4