CREATE TABLE table_name_63 (year_joined VARCHAR2, enrollment VARCHAR2, ihsaa_class VARCHAR2)

What year joined had an enrollment less than 438 and an AA as the IHSAA Class?
SELECT year_joined FROM table_name_63 WHERE enrollment < 438 AND ihsaa_class = "aa"
SELECT "year_joined" FROM "table_name_63" WHERE "aa" = "ihsaa_class" AND "enrollment" < 438