Database: european_football_2
Question: Among all the players whose weight is under 130, how many of them preferred foot in attacking is left?
SQL: SELECT COUNT(DISTINCT t1.id) FROM Player AS t1 INNER JOIN Player_Attributes AS t2 ON t1.player_api_id = t2.player_api_id WHERE t1.weight < 130 AND t2.preferred_foot = 'left'