CREATE TABLE "titles" (
  "swedish_title" text,
  "norwegian_title" text,
  "translated_title" text,
  "published" real,
  "pages" real,
  "isbn" text
);

Question: How many pages associated with isbn 91-7713-035-9?
SQL: SELECT SUM("pages") FROM "titles" WHERE "isbn"='isbn 91-7713-035-9';