What was the first leg score in the 2nd round?
CREATE TABLE "borussia_m_nchengladbach" (
  "round" text,
  "opposition" text,
  "first_leg" text,
  "second_leg" text,
  "aggregate_score" text
);
SELECT "first_leg" FROM "borussia_m_nchengladbach" WHERE "round"='2nd';