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

what school has 3 football classes but only has 638 student enrollment ?
SELECT "school" FROM table_204_624 WHERE "football class" = 3 AND "enrollment (2010-11 & 2011-12)" = 638
SELECT "school" FROM "table_204_624" WHERE "enrollment (2010-11 & 2011-12)" = 638 AND "football class" = 3