CREATE TABLE table_name_78 (tournament VARCHAR2, surface VARCHAR2, date VARCHAR2)

Which tournament has hard as the surface and apr. 12, 1998 as the date?
SELECT tournament FROM table_name_78 WHERE surface = "hard" AND date = "apr. 12, 1998"
SELECT "tournament" FROM "table_name_78" WHERE "apr. 12, 1998" = "date" AND "hard" = "surface"