CREATE TABLE table_204_864 (id NUMBER, "pos" NUMBER, "class" CLOB, "no" NUMBER, "team" CLOB, "drivers" CLOB, "chassis" CLOB, "engine" CLOB)

how many times did franz race with his simca 2.0 l engine ?
SELECT COUNT(*) FROM table_204_864 WHERE "drivers" = 'franz hummel' AND "engine" = 'roc-simca 2.0l i4'
SELECT COUNT(*) FROM "table_204_864" WHERE "drivers" = 'franz hummel' AND "engine" = 'roc-simca 2.0l i4'