Table: uruguay_rankings
Columns: index_year
author_editor_source
year_of_publication
countries_sampled
world_ranking_1
ranking_l_a_2

Question: What index was created by the United Nations (UNDP) and reached 2nd place in the LA Ranking?
SQL: SELECT "index_year" FROM uruguay_rankings WHERE "author_editor_source" = 'United Nations (UNDP)' AND "ranking_l_a_2" = '2nd'

Question: How many countries were sampled in the index created by The Economist, published in 2007 and ranked 2nd in the LA Ranking?
SQL: SELECT MAX("countries_sampled") FROM uruguay_rankings WHERE "author_editor_source" = 'The Economist' AND "year_of_publication" = '2007' AND "ranking_l_a_2" = '2nd'

Question: What's the wold ranking of the index by Transparency International?
SQL: SELECT "world_ranking_1" FROM uruguay_rankings WHERE "author_editor_source" = 'Transparency International'

Question: How many countries were sampled for the index in 2nd place in the LA ranking and 23rd in the world ranking?
SQL: SELECT "countries_sampled" FROM uruguay_rankings WHERE "ranking_l_a_2" = '2nd' AND "world_ranking_1" = '23rd'

Question: How many countries were sampled for the Prosperity Index (2008)?
SQL: SELECT MAX("countries_sampled") FROM uruguay_rankings WHERE "index_year" = 'Prosperity Index (2008)'