CREATE TABLE "core_county_population_statistics" (
  "county" text,
  "1900" real,
  "1930" real,
  "1950" real,
  "2000" real,
  "2006_est" real
);

Question: What is the 1930 population when the 2006 est. is less than 44,726 in the county of frio?
SQL: SELECT SUM("1930") FROM "core_county_population_statistics" WHERE "2006_est"<'44,726' AND "county"='frio';

Question: What is the highest 1930 population when the 2000 population is 43,966 and the 1900 population is less than 8,401?
SQL: SELECT MAX("1930") FROM "core_county_population_statistics" WHERE "2000"='43,966' AND "1900"<'8,401';