when has an Opponent of @ philadelphia phillies and an Attendance of 20,072?
CREATE TABLE "game_log" (
  "date" text,
  "opponent" text,
  "score" text,
  "loss" text,
  "attendance" text,
  "record" text
);
SELECT "date" FROM "game_log" WHERE "opponent"='@ philadelphia phillies' AND "attendance"='20,072';