CREATE TABLE table_23215 ("Institution" TEXT, "Location" TEXT, "Nickname" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Joined" FLOAT)

What is the type of the school whose students' nickname is tigers?
SELECT "Type" FROM table_23215 WHERE "Nickname" = 'Tigers'
SELECT "Type" FROM "table_23215" WHERE "Nickname" = 'Tigers'