What's the lowest Floors with Feet that's larger htan 262, has a Name of Standard Bank Building, and Metres that's larger htan 138.8?
CREATE TABLE "timeline_of_tallest_skyscrapers_in_afric" (
  "name" text,
  "city" text,
  "years_as_tallest" text,
  "metres" real,
  "feet" real,
  "floors" real
);
SELECT MIN("floors") FROM "timeline_of_tallest_skyscrapers_in_afric" WHERE "feet">262 AND "name"='standard bank building' AND "metres">138.8;