Table: football_transfers
Columns: rank
player
from
transfer_fee_million
year

Question: How many transfer fees did Afonso Alves have after 2008?
SQL: SELECT COUNT("transfer_fee_million") FROM football_transfers WHERE "player" = 'afonso alves' AND "year" > 2008

Question: What was the highest transfer fee in 2008 that is from psv and is ranked larger than 17?
SQL: SELECT MAX("transfer_fee_million") FROM football_transfers WHERE "year" = 2008 AND "from" = 'psv' AND "rank" > 17

Question: Who has a transfer fee larger than 12 from ajax in 2006 while ranked higher than 17?
SQL: SELECT "player" FROM football_transfers WHERE "transfer_fee_million" > 12 AND "rank" > 17 AND "year" > 2006 AND "from" = 'ajax'