When esv ingolstadt is the oberbayern b what is the  niederbayern?
CREATE TABLE "southern_bavaria" (
  "season" text,
  "oberbayern_a" text,
  "oberbayern_b" text,
  "niederbayern" text,
  "schwaben" text,
  "oberpfalz" text
);
SELECT "niederbayern" FROM "southern_bavaria" WHERE "oberbayern_b"='ESV Ingolstadt';