CREATE TABLE table_52147 ("Result" CLOB, "Opponent" CLOB, "Method" CLOB, "Event" CLOB, "Round" FLOAT, "Location" CLOB)

How many rounds was the fight against carter williams?
SELECT "Round" FROM table_52147 WHERE "Opponent" = 'carter williams'
SELECT "Round" FROM "table_52147" WHERE "Opponent" = 'carter williams'