user: Question: Nickname of the school established in 1773
Columns: ['Institution', 'Location', 'Nickname', 'Enrollment', 'Established']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['University of Delaware', 'Newark, DE', 'Blue Hens', 19391.0, 1743.0]
SQL:

assistant: SELECT "Nickname" FROM "Table" WHERE "Established" = 1773.0;