CREATE TABLE "champions_by_country" (
  "country" text,
  "amateur_era" real,
  "open_era" real,
  "all_time" real,
  "first_title" real,
  "last_title" real
);

Question: What is the sum of All-Time, when Amateur Era is less than 0?
SQL: SELECT SUM("all_time") FROM "champions_by_country" WHERE "amateur_era"<0;

Question: What is the lowest All-Time, when First Title is before 1974, when Last Title is "1933", and when Amateur Era is greater than 2?
SQL: SELECT MIN("all_time") FROM "champions_by_country" WHERE "first_title"<1974 AND "last_title"=1933 AND "amateur_era">2;

Question: What is the lowest All-Time, when First Title is "2007, and when Amateur Era is greater than 0?
SQL: SELECT MIN("all_time") FROM "champions_by_country" WHERE "first_title"=2007 AND "amateur_era">0;

Question: What is the lowest First Title, when All-Time is greater than 1, when Country is "United States (USA)", and when Amateur Era is greater than 17?
SQL: SELECT MIN("first_title") FROM "champions_by_country" WHERE "all_time">1 AND "country"='united states (usa)' AND "amateur_era">17;