CREATE TABLE table_28498 ("Institution" TEXT, "Location" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Joined" FLOAT, "Nickname" TEXT)

How many joined the Warriors?
SELECT COUNT("Joined") FROM table_28498 WHERE "Nickname" = 'Warriors'
SELECT COUNT("Joined") FROM "table_28498" WHERE "Nickname" = 'Warriors'