CREATE TABLE table_203_406 (id NUMBER, "entrant" CLOB, "constructor" CLOB, "chassis" CLOB, "engine" CLOB, "tyre" CLOB, "driver" CLOB, "rounds" CLOB)

how many drivers drove all the rounds ?
SELECT COUNT("driver") FROM table_203_406 WHERE "rounds" = 'all'
SELECT COUNT("driver") FROM "table_203_406" WHERE "rounds" = 'all'