user: Question: What is the highest number of school enrollment for Union Star High School in De Kalb county?
Columns: ['School', 'Team Name', 'Town', 'County', 'School Enrollment (2008–10)', 'Football?']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['De Kalb High School', 'Tigers', 'De Kalb', 'Buchanan', 118.0, 'Y']
SQL:

assistant: SELECT MAX("School Enrollment (2008–10)") FROM "Table" WHERE "County" = 'De Kalb' AND "School" = 'Union Star High School';