CREATE TABLE table_31704 ("Res." CLOB, "Record" CLOB, "Opponent" CLOB, "Method" CLOB, "Event" CLOB, "Round" FLOAT, "Location" CLOB)

Which opponent has a record of 3-0?
SELECT "Opponent" FROM table_31704 WHERE "Record" = '3-0'
SELECT "Opponent" FROM "table_31704" WHERE "Record" = '3-0'