What's the resolution of the model with a PPD of 69?
CREATE TABLE "retina_display_models" (
  "model" text,
  "ppi_pixels_per_inch" real,
  "ppcm_pixels_per_cm" real,
  "resolution" text,
  "typical_viewing_distance_in_cm" text,
  "pixels_per_degree_ppd" real
);
SELECT "resolution" FROM "retina_display_models" WHERE "pixels_per_degree_ppd"=69;