CREATE TABLE "other" (
  "index_year" text,
  "author_editor_source" text,
  "year_of_publication" text,
  "countries_sampled" real,
  "world_ranking_1" text,
  "ranking_l_a_2" text
);

Question: How many items were under ranking l.a.(2) when the world ranking was 21st?
SQL: SELECT COUNT("ranking_l_a_2") FROM "other" WHERE "world_ranking_1"='21st';

Question: What was the author/editor/source when the l.a. ranking was 1st?
SQL: SELECT "author_editor_source" FROM "other" WHERE "ranking_l_a_2"='1st';

Question: How many years were listed under index when there were 157 countries sampled?
SQL: SELECT COUNT("index_year") FROM "other" WHERE "countries_sampled"=157;

Question: What was the publication year ranking l.a. is 1st?
SQL: SELECT "year_of_publication" FROM "other" WHERE "ranking_l_a_2"='1st';

Question: How many years were recorded when world ranking was 21st?
SQL: SELECT COUNT("index_year") FROM "other" WHERE "world_ranking_1"='21st';