CREATE TABLE table_204_624 (id DECIMAL, "school" TEXT, "team name" TEXT, "town" TEXT, "county" TEXT, "enrollment  ( 2010-11 & 2011-12 ) " DECIMAL, "primary mshsaa class*" DECIMAL, "football class" DECIMAL)

which school has the largest enrollment ?
SELECT "school" FROM table_204_624 ORDER BY "enrollment (2010-11 & 2011-12)" DESC LIMIT 1
SELECT "school" FROM "table_204_624" ORDER BY "enrollment (2010-11 & 2011-12)" DESC NULLS LAST LIMIT 1