How many copies were sold when the 1st week sales were 4,590+?
CREATE TABLE "studio_albums" (
  "year" real,
  "album" text,
  "oricon_position" real,
  "1st_week_sales" text,
  "copies_sold" text
);
SELECT "copies_sold" FROM "studio_albums" WHERE "1st_week_sales"='4,590+';