CREATE TABLE table_203_339 (id NUMBER, "year" CLOB, "car" NUMBER, "start" NUMBER, "qual" NUMBER, "rank" NUMBER, "finish" NUMBER, "laps" NUMBER, "led" NUMBER, "retired" CLOB)

what is the difference between the qualfying time in 1967 and 1965 ?
SELECT (SELECT "qual" FROM table_203_339 WHERE "year" = 1967) - (SELECT "qual" FROM table_203_339 WHERE "year" = 1965)
SELECT (SELECT "qual" FROM "table_203_339" WHERE "year" = 1967) - (SELECT "qual" FROM "table_203_339" WHERE "year" = 1965)