CREATE TABLE table_203_506 (id NUMBER, "opponent" CLOB, "played" NUMBER, "won" NUMBER, "lost" NUMBER, "drawn" NUMBER, "% won overall" CLOB)

how many teams did they not lose to ?
SELECT COUNT("opponent") FROM table_203_506 WHERE "lost" = 0
SELECT COUNT("opponent") FROM "table_203_506" WHERE "lost" = 0