CREATE TABLE table_name_81 (joined INT, city VARCHAR, conference_championships VARCHAR)

What is the lowest year joined in the city of College Park at the Conference championships smaller than 0?
SELECT MIN(joined) FROM table_name_81 WHERE city = "college park" AND conference_championships < 0
SELECT MIN("joined") FROM "table_name_81" WHERE "city" = "college park" AND "conference_championships" < 0