user: Question: Where is the moving from location with a transfer window of Summer and the source kerkida.net?
Columns: ['Nat.', 'Name', 'Moving from', 'Type', 'Transfer window', 'Ends', 'Transfer fee', 'Source']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['GRE', 'Poursaitides', 'Anorthosis Famagusta', 'Transfer', 'Summer', 2010.0, 'Free', '24sports.com.cy']
SQL:

assistant: SELECT "Moving from" FROM "Table" WHERE "Transfer window" = 'Summer' AND "Source" = 'kerkida.net';