Table: europa_cup_matches
Columns: season
competition
round
club
1st_leg
2nd_leg

Question: What is the 1st leg of the UEFA Champions League Compeition in the Skonto Riga Club?
SQL: SELECT "1st_leg" FROM europa_cup_matches WHERE "competition" = 'uefa champions league' AND "club" = 'skonto riga'

Question: Which season has the Renova Club?
SQL: SELECT "season" FROM europa_cup_matches WHERE "club" = 'renova'

Question: Which season has the Werder Bremen Club and is in Round 2r?
SQL: SELECT "season" FROM europa_cup_matches WHERE "club" = 'werder bremen' AND "round" = '2r'

Question: Which round is the UEFA Cup Compeition and the Kolkheti-1913 Poti Cub?
SQL: SELECT "round" FROM europa_cup_matches WHERE "competition" = 'uefa cup' AND "club" = 'kolkheti-1913 poti'