CREATE TABLE "mother_tongue_language_2006_and_2011" (
  "mother_tongue" text,
  "population_2006" real,
  "percentage_2006" text,
  "population_2011" real,
  "percentage_2011" text
);

Question: What is every value for population (2006) with a Romanian mother tongue?
SQL: SELECT "population_2006" FROM "mother_tongue_language_2006_and_2011" WHERE "mother_tongue"='Romanian';

Question: What is the lowest population(2011)?
SQL: SELECT MIN("population_2011") FROM "mother_tongue_language_2006_and_2011";

Question: What is the lowest population(2006) when there is a 1.06% in 2011?
SQL: SELECT MIN("population_2006") FROM "mother_tongue_language_2006_and_2011" WHERE "percentage_2011"='1.06%';

Question: How many values for population(2011) correspond to a 1.40% in 2006?
SQL: SELECT COUNT("population_2011") FROM "mother_tongue_language_2006_and_2011" WHERE "percentage_2006"='1.40%';

Question: What is every value for percentage(2006) with a Polish mother tongue?
SQL: SELECT "percentage_2006" FROM "mother_tongue_language_2006_and_2011" WHERE "mother_tongue"='Polish';