CREATE TABLE "completed_bridges" (
  "rank" real,
  "name" text,
  "span_metres" real,
  "span_feet" real,
  "material" text,
  "year_opened" text,
  "country" text
);

Question: What is the lowest amount of Span metres when the year opened is 2007, the country is China, rank is less than 13, and the span feet is less than 1378?
SQL: SELECT MIN("span_metres") FROM "completed_bridges" WHERE "year_opened"='2007' AND "country"='china' AND "rank"<13 AND "span_feet"<1378;

Question: Which country's material was concrete when the span metres were less than 270, span feet is more than 837, and the year opened was 1943?
SQL: SELECT "country" FROM "completed_bridges" WHERE "material"='concrete' AND "span_metres"<270 AND "span_feet">837 AND "year_opened"='1943';