On which air date was Robert the test-taker?
CREATE TABLE table_name_31 (air_date VARCHAR, test_taker VARCHAR)
SELECT air_date FROM table_name_31 WHERE test_taker = "robert"
### Context: CREATE TABLE table_name_31 (air_date VARCHAR, test_taker VARCHAR) ### Question: On which air date was Robert the test-taker? ### Answer: SELECT air_date FROM table_name_31 WHERE test_taker = "robert"