CREATE TABLE "population_of_the_neighbourhoods_by_age_" (
  "quartier" text,
  "pct_0_19_years" text,
  "pct_20_39_years" text,
  "pct_40_59_years" text,
  "pct_60_74_years" text,
  "pct_75_years_and" text
);

Question: How many o-19% are where the quartier is in saint-loup?
SQL: SELECT "pct_0_19_years" FROM "population_of_the_neighbourhoods_by_age_" WHERE "quartier"='Saint-Loup';

Question: how many 20-39% are in pont-de-vivaux?
SQL: SELECT COUNT("pct_20_39_years") FROM "population_of_the_neighbourhoods_by_age_" WHERE "quartier"='Pont-de-Vivaux';

Question: the quartier menpenti has how many 40-59 year olds?
SQL: SELECT "pct_40_59_years" FROM "population_of_the_neighbourhoods_by_age_" WHERE "quartier"='Menpenti';