Task: Text to Code
Input (English): Step 1: For each row in players table, find the corresponding rows in matches table.
Step 2: find country_code, first_name of the results of step 1 whose loser_ioc equals WTA Championships.
Step 3: find country_code, first_name of the results of step 1 whose loser_ioc equals Australian Open.
Step 4: show the rows that are in both the results of step 2 and the results of step 3
Output (English): SELECT T1.country_code , T1.first_name FROM players AS T1 JOIN matches AS T2 ON T1.player_id = T2.loser_id WHERE T2.loser_ioc = "WTA Championships" INTERSECT SELECT T1.country_code , T1.first_name FROM players AS T1 JOIN matches AS T2 ON T1.player_id = T2.loser_id WHERE T2.loser_ioc = "Australian Open"