CREATE TABLE "births_and_deaths" (
  "periodo" text,
  "births" real,
  "deaths" real,
  "difference" real,
  "cbr" real,
  "cdr" real,
  "imr" real,
  "tfr" real
);

Question: What is the lowest CDR that has 112 as the difference?
SQL: SELECT MIN("cdr") FROM "births_and_deaths" WHERE "difference"=112;

Question: What TFR has births less than 131, with 125 as an IMR?
SQL: SELECT "tfr" FROM "births_and_deaths" WHERE "births"<131 AND "imr"=125;

Question: What average deaths have 15,0 as the IMR, with a CDR greater than 4,0?
SQL: SELECT AVG("deaths") FROM "births_and_deaths" WHERE "imr"='15,0' AND "cdr">'4,0';