Question: How many transfer windows coming from Crystal Palace?
SQL: SELECT COUNT("Transfer window") FROM "1-17596418-4" WHERE "Moving from" = 'Crystal Palace';

Question: What country has a P of GK?
SQL: SELECT "Country" FROM "1-17596418-4" WHERE "P" = 'GK';

Question: What is the P for the player moving from Everton?
SQL: SELECT "P" FROM "1-17596418-4" WHERE "Moving from" = 'Everton';