user: Question: What is the lowest year joined in the city of college park at the Conference championships smaller than 0?
Columns: ['Institution', 'City', 'State', 'Nickname', 'Joined', 'Conference championships']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['George Washington University', 'Washington', 'District of Columbia', 'Colonials', 1995.0, 0.0]
SQL:

assistant: SELECT MIN("Joined") FROM "Table" WHERE "City" = 'college park' AND "Conference championships" < 0.0;