What is Visitor, when Home is Philadelphia, and when Date is November 18?
CREATE TABLE "regular_season" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" real,
  "record" text,
  "points" real
);
SELECT "visitor" FROM "regular_season" WHERE "home"='philadelphia' AND "date"='november 18';