CREATE TABLE table_64906 ("School" TEXT, "City" TEXT, "Team Name" TEXT, "County" TEXT, "Year Joined" TEXT, "Year Left" TEXT)

What year did a school from Jennings County join?
SELECT "Year Joined" FROM table_64906 WHERE "School" = 'jennings county'
SELECT "Year Joined" FROM "table_64906" WHERE "School" = 'jennings county'