CREATE TABLE table_64904 ("School" CLOB, "City" CLOB, "Team Name" CLOB, "County" CLOB, "Year Joined" CLOB, "Year Left" CLOB)

What year did a team from North Dearborn leave?
SELECT "Year Left" FROM table_64904 WHERE "School" = 'north dearborn'
SELECT "Year Left" FROM "table_64904" WHERE "School" = 'north dearborn'