What is the 2nd leg when team #1 is Rubin Kazan?
CREATE TABLE "belarusian_clubs_in_euporean_cups" (
  "round" text,
  "team_num1" text,
  "agg" text,
  "team_num2" text,
  "1st_leg" text,
  "2nd_leg" text
);
SELECT "2nd_leg" FROM "belarusian_clubs_in_euporean_cups" WHERE "team_num1"='rubin kazan';