CREATE TABLE table_64242 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "Enrollment" FLOAT, "IHSAA Class" TEXT, "County" TEXT, "Year Joined" FLOAT, "Previous Conference" TEXT)

Name the lowest Year Joined which has a Mascot of pioneers?
SELECT MIN("Year Joined") FROM table_64242 WHERE "Mascot" = 'pioneers'
SELECT MIN("Year Joined") FROM "table_64242" WHERE "Mascot" = 'pioneers'