Table: arsenal_player_stats
Columns: nat
name
since
goals
ends
transfer_fee

Question: What is Since, when Transfer Fee is "£ 12m"?
SQL: SELECT "since" FROM arsenal_player_stats WHERE "transfer_fee" = '£ 12m'

Question: What is Name, when Goals is greater than 14, and when Transfer Fee is "Youth System"?
SQL: SELECT "name" FROM arsenal_player_stats WHERE "goals" > 14 AND "transfer_fee" = 'youth system'

Question: What is Nat., when Name is "Fàbregas ( Captain )"?
SQL: SELECT "nat" FROM arsenal_player_stats WHERE "name" = 'fàbregas ( captain )'