CREATE TABLE table_203_392 (id NUMBER, "rank" CLOB, "belt alternate 1" CLOB, "belt alternate 2" CLOB, "belt alternate 3" CLOB, "belt alternate 4" CLOB)

which kyu levels have only one color belt ?
SELECT "rank" FROM table_203_392 WHERE "belt alternate 2" IS NULL
SELECT "rank" FROM "table_203_392" WHERE "belt alternate 2" IS NULL