Table: player_stats_90_91
Columns: player
club
league
fa_cup
fa_trophy
league_cup
total

Question: Which League Cup has a FA Cup of 5, and a Club of boston united, and a League smaller than 16?
SQL: SELECT MAX("league_cup") FROM player_stats_90_91 WHERE "fa_cup" = 5 AND "club" = 'boston united' AND "league" < 16

Question: How many Total that has a FA Trophy of 0 and a Player of charlie butler?
SQL: SELECT COUNT("total") FROM player_stats_90_91 WHERE "fa_trophy" = 0 AND "player" = 'charlie butler'

Question: How many  FA Trophy has a Player of mario walsh and a League larger than 17?
SQL: SELECT AVG("fa_trophy") FROM player_stats_90_91 WHERE "player" = 'mario walsh' AND "league" > 17