CREATE TABLE table_name_24 (date VARCHAR, opponent VARCHAR, attendance VARCHAR)

On what date was there a game in which the opponent was the Detroit Tigers, and the attendance was 38,639?
SELECT date FROM table_name_24 WHERE opponent = "detroit tigers" AND attendance = "38,639"
SELECT "date" FROM "table_name_24" WHERE "38,639" = "attendance" AND "detroit tigers" = "opponent"