How much Standard Rank has a Name of 311 south wacker drive, and a Year larger than 1990?
CREATE TABLE "tallest_buildings_by_pinnacle_height" (
  "pinn_rank" real,
  "std_rank" real,
  "name" text,
  "pinnacle_height_ft_m" text,
  "standard_height_ft_m" text,
  "floors" real,
  "year" real
);
SELECT SUM("std_rank") FROM "tallest_buildings_by_pinnacle_height" WHERE "name"='311 south wacker drive' AND "year">1990;