Table: player_stats_7
Columns: nat
name
since
goals
ends
transfer_fee

Question: What is the total number of Since with a Goals larger than 6, and a Name with deco?
SQL: SELECT COUNT("since") FROM player_stats_7 WHERE "goals" > 6 AND "name" = 'deco'

Question: What is the average Ends with a Since of 2003, and a Name with márquez?
SQL: SELECT AVG("ends") FROM player_stats_7 WHERE "since" = 2003 AND "name" = 'márquez'

Question: What is the sum of Ends with a Name of abidal, and has a Since larger than 2007?
SQL: SELECT SUM("ends") FROM player_stats_7 WHERE "name" = 'abidal' AND "since" > 2007