CREATE TABLE table_74804 ("Air Date" CLOB, "Challenge" CLOB, "Winner" CLOB, "Test-taker" CLOB, "Passed?" CLOB)

On which air date was Robert the test-taker?
SELECT "Air Date" FROM table_74804 WHERE "Test-taker" = 'robert'
SELECT "Air Date" FROM "table_74804" WHERE "Test-taker" = 'robert'