What attendance has astros as the opponent, and april 29 as the date?
CREATE TABLE "game_log" (
  "date" text,
  "opponent" text,
  "score" text,
  "loss" text,
  "attendance" real,
  "record" text
);
SELECT SUM("attendance") FROM "game_log" WHERE "opponent"='astros' AND "date"='april 29';