SELECT T1.country_code ,  T1.first_name FROM players AS T1 JOIN matches AS T2 ON T1.player_id  =  T2.winner_id WHERE T2.tourney_name  =  'WTA Championships' INTERSECT SELECT T1.country_code ,  T1.first_name FROM players AS T1 JOIN matches AS T2 ON T1.player_id  =  T2.winner_id WHERE T2.tourney_name  =  'Australian Open'
What are the country code and first name of the players who won in both tourney WTA Championships and Australian Open?
SELECT T1.country_code , T1.first_name FROM players AS T1 JOIN matches AS T2 ON T1.player_id = T2.winner_id WHERE T2.tourney_name = 'WTA Championships ' INTERSECT SELECT T1.country_code , T1.first_name FROM players AS T1 JOIN matches AS T2 ON T1.player_id = T2.winner_id WHERE T2.tourney_name = 'Australian Open '
select t1 . country_code , t1 . first_name from players as t1 join matches as t2 on t1 . player_id = t2 . winner_id where t2 . tourney_name = value intersect select t1 . country_code , t1 . first_name from players as t1 join matches as t2 on t1 . player_id = t2 . winner_id where t2 . tourney_name = value
What are the country code and first name of the players who won in both tourney WTA Championships and Australian Open ?