user: Question: What was the major version when the webkit version was 528.17?
Columns: ['Major version', 'Minor version', 'WebKit version', 'Operating System', 'Release date', 'Features']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Safari 3', '3.1.1', '525.17', 'Windows XP , Vista', 'April 16, 2008', 'Improved stability and added security updates.']
SQL:

assistant: SELECT "Major version" FROM "Table" WHERE "WebKit version" = '528.17';