CREATE TABLE "birds" (
  "species" text,
  "order" text,
  "family" text,
  "species_worldwide" real,
  "species_on_r_union" real
);

Question: Which species on Réunion island is part of the procellariiformes order and is part of the hydrobatidae family and has less than 21 species worldwide?
SQL: SELECT SUM("species_on_r_union") FROM "birds" WHERE "order"='procellariiformes' AND "family"='hydrobatidae' AND "species_worldwide"<21;

Question: How many species does the sternidae family have worldwide with less than 9 species on Réunion?
SQL: SELECT COUNT("species_worldwide") FROM "birds" WHERE "family"='sternidae' AND "species_on_r_union"<9;

Question: How many species on Réunion do the dromadidae family have with a worldwide speices larger than 1?
SQL: SELECT SUM("species_on_r_union") FROM "birds" WHERE "family"='dromadidae' AND "species_worldwide">1;