CREATE TABLE table_203_742 (id DECIMAL, "rnd" DECIMAL, "date" TEXT, "race name" TEXT, "circuit" TEXT, "city/location" TEXT, "pole position" TEXT, "fastest lap" TEXT, "winning driver" TEXT, "winning team" TEXT, "report" TEXT)

how many circuits did were run ?
SELECT COUNT("circuit") FROM table_203_742
SELECT COUNT("circuit") FROM "table_203_742"