How many bullet tips colors had other features of a blue band on case base?
CREATE TABLE "headstamps_and_colour_coding" (
  "headstamp_id" text,
  "primer_annulus_color" text,
  "bullet_tip_color" text,
  "other_features" text,
  "functional_type" text
);
SELECT COUNT("bullet_tip_color") FROM "headstamps_and_colour_coding" WHERE "other_features"='Blue band on case base';