CREATE TABLE table_203_18 (id NUMBER, "year" NUMBER, "film" CLOB, "role" CLOB, "co-star" CLOB, "director" CLOB, "notes" CLOB)

how long has she been making films ?
SELECT (SELECT MAX("year") FROM table_203_18) - (SELECT MIN("year") FROM table_203_18)
SELECT (SELECT MAX("year") FROM "table_203_18") - (SELECT MIN("year") FROM "table_203_18")