CREATE TABLE table_203_688 (id NUMBER, "category" CLOB, "speed\ ( km/h ) " NUMBER, "speed\ ( mph ) " NUMBER, "vehicle" CLOB, "pilot" CLOB, "date" CLOB)

what is the least fastest aircraft ?
SELECT "category" FROM table_203_688 ORDER BY "speed\n(km/h)" LIMIT 1
SELECT "category" FROM "table_203_688" ORDER BY "speed\n(km/h)" FETCH FIRST 1 ROWS ONLY