CREATE TABLE table_51417 ("Year" FLOAT, "Event" CLOB, "Record" CLOB, "Athlete" CLOB, "Nationality" CLOB)

Which athlete performed before 1984 in an 800 m event?
SELECT "Athlete" FROM table_51417 WHERE "Year" < '1984' AND "Event" = '800 m'
SELECT "Athlete" FROM "table_51417" WHERE "Event" = '800 m' AND "Year" < '1984'