CREATE TABLE "1950s" (
  "country" text,
  "1951" real,
  "1952" real,
  "1953" real,
  "1954" real,
  "1955" real,
  "1956" real,
  "1957" real,
  "1958" real,
  "1959" real
);

Question: What is the 1957 number when the 1955 is smaller than 0.63, and 1952 is larger than 0.22?
SQL: SELECT COUNT("1957") FROM "1950s" WHERE "1955"<0.63 AND "1952">0.22;

Question: What is the 1952 rate when the 1954 is more than 4.2?
SQL: SELECT SUM("1952") FROM "1950s" WHERE "1954">4.2;

Question: What is the 1955 rate when the 1956 is more than 2.9, and 1953 is larger than 4.5?
SQL: SELECT SUM("1955") FROM "1950s" WHERE "1956">2.9 AND "1953">4.5;