user: Question: What is the 1st leg when 2nd leg is 1–0 and competition is UEFA Champions League?
Columns: ['Season', 'Competition', 'Round', 'Club', '1st leg', '2nd leg', 'Aggregate']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1983–84', 'UEFA Cup', 'First round', 'Tottenham Hotspur F.C.', '0–6', '0–8', '0–14']
SQL:

assistant: SELECT "1st leg" FROM "Table" WHERE "2nd leg" = '1–0' AND "Competition" = 'UEFA Champions League';