user: Question: How many schools did Derrick Green attend?
Columns: ['Player', 'Position', 'School', 'Hometown', 'College']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Austin Kafentzis ‡‡', 'Quarterback', 'Jordan High School', 'Sandy, Utah', 'Wisconsin']
SQL:

assistant: SELECT COUNT("School") FROM "Table" WHERE "Player" = 'Derrick Green';