CREATE TABLE "regular_season" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "decision" text,
  "attendance" real,
  "record" text
);

Question: Who is the visitor in Philadelphia on March 6?
SQL: SELECT "visitor" FROM "regular_season" WHERE "home"='philadelphia' AND "date"='march 6';