CREATE TABLE table_1203 ("No" FLOAT, "Date" CLOB, "Round" CLOB, "Circuit" CLOB, "Pole Position" CLOB, "Fastest Lap" CLOB, "Race Winner" CLOB, "Report" CLOB)

Which round was the circuit Assen
SELECT "Round" FROM table_1203 WHERE "Circuit" = 'Assen'
SELECT "Round" FROM "table_1203" WHERE "Circuit" = 'Assen'