What is the sum of all silver medals with less than 23 medals in total and more than 3 bronze medals for the United States?
CREATE TABLE "all_time_medal_tables" (
  "rank" text,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT SUM("silver") FROM "all_time_medal_tables" WHERE "total"<23 AND "nation"='united states' AND "bronze">3;