CREATE TABLE table_34887 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" TEXT, "Record" TEXT)

when has an Opponent of @ philadelphia phillies and an Attendance of 20,072?
SELECT "Date" FROM table_34887 WHERE "Opponent" = '@ philadelphia phillies' AND "Attendance" = '20,072'
SELECT "Date" FROM "table_34887" WHERE "Attendance" = '20,072' AND "Opponent" = '@ philadelphia phillies'