CREATE TABLE table_20716 ("Institution" TEXT, "Location" TEXT, "Team Nickname" TEXT, "Joined TSCHL" FLOAT, "Home Arena" TEXT, "Capacity" FLOAT, "Team Website" TEXT)

What's the earliest year anybody joined the hockey league?
SELECT MIN("Joined TSCHL") FROM table_20716
SELECT MIN("Joined TSCHL") FROM "table_20716"