CREATE TABLE table_57167 ("Round" FLOAT, "Grand Prix" CLOB, "Date" CLOB, "Location" CLOB, "Pole Position" CLOB, "Fastest Lap" CLOB, "Winning Driver" CLOB, "Winning Constructor" CLOB, "Report" CLOB)

What is the highest round on 5 april?
SELECT MAX("Round") FROM table_57167 WHERE "Date" = '5 april'
SELECT MAX("Round") FROM "table_57167" WHERE "Date" = '5 april'