CREATE TABLE table_203_473 (id NUMBER, "no." NUMBER, "date" CLOB, "tournament" CLOB, "winning score" CLOB, "margin\ of victory" CLOB, "runner ( s ) -up" CLOB)

what were the total number of times the u.s. open was the tournament ?
SELECT COUNT(*) FROM table_203_473 WHERE "tournament" = 'u.s. open'
SELECT COUNT(*) FROM "table_203_473" WHERE "tournament" = 'u.s. open'