CREATE TABLE table_5610 ("School" CLOB, "Location" CLOB, "Mascot" CLOB, "County" CLOB, "Year Joined" FLOAT, "Previous Conference" CLOB, "Year Left" FLOAT, "Conference Joined" CLOB)

Which Conference Joined has a Previous Conference of northwestern, and a Mascot of oilers?
SELECT "Conference Joined" FROM table_5610 WHERE "Previous Conference" = 'northwestern' AND "Mascot" = 'oilers'
SELECT "Conference Joined" FROM "table_5610" WHERE "Mascot" = 'oilers' AND "Previous Conference" = 'northwestern'