CREATE TABLE "4_tatars" (
  "c_w_15" real,
  "oblast_age" text,
  "15_to_17" real,
  "18_to_19" real,
  "20_to_24" real,
  "25_to_29" real,
  "30_to_34" real,
  "35_to_39" real,
  "40_to_44" real,
  "45_to_49" real,
  "50_to_54" real,
  "55_to_59" real,
  "60_to_64" real,
  "65_to_69" real,
  "70" real
);

Question: what is the number for 65-69 where 50-54 is 1571?
SQL: SELECT "65_to_69" FROM "4_tatars" WHERE "50_to_54"=1571;

Question: what is the minimum of 60 -64?
SQL: SELECT MIN("60_to_64") FROM "4_tatars";

Question: what is the maximum 18 to 19 and 30-34  is 1203?
SQL: SELECT MAX("18_to_19") FROM "4_tatars" WHERE "30_to_34"=1203;

Question: what is the maximum 65-69 and 35-39 is 1606?
SQL: SELECT MAX("65_to_69") FROM "4_tatars" WHERE "35_to_39"=1606;