diff --git a/02_select_from_world_tutorial.sql b/02_select_from_world_tutorial.sql
index ae12da3..0b3721b 100644
--- a/02_select_from_world_tutorial.sql
+++ b/02_select_from_world_tutorial.sql
@@ -30,3 +30,44 @@ WHERE name IN ('France', 'Germany', 'Italy')
 SELECT name country
 FROM world
 WHERE name LIKE '%United%'
+
+-- 7. Show the countries that are big by area or big by population.
+-- Show name, population and area.
+SELECT name, population, area
+FROM world
+WHERE area > 3000000 OR population > 250000000
+
+-- 8. Show the countries that are big by area or big by population but not both.
+-- Show name, population and area.
+SELECT name, population, area
+FROM world
+WHERE area > 3000000 XOR population > 250000000
+
+-- 9. For South America show population in millions and GDP in billions both to 2
+-- decimal places.
+SELECT name, ROUND(population/1000000, 2), ROUND(GDP/1000000000, 2)
+FROM world
+WHERE continent = 'South America'
+
+-- 10. Show per-capita GDP for the trillion dollar countries to the nearest $1000.
+SELECT name, ROUND(GDP/population, -3)
+FROM world
+WHERE GDP >= 1000000000000
+
+-- 11. Show the name and capital where the name and the capital have the same number
+-- of characters.
+SELECT name, capital
+FROM world
+WHERE LENGTH(name) = LENGTH(capital)
+
+-- 12. Show the name and the capital where the first letters of each match. Don't
+-- include countries where the name and the capital are the same word.
+SELECT name, capital
+FROM world
+WHERE LEFT(name, 1) = LEFT(capital,1) AND name <> capital
+
+-- 13. Find the country that has all the vowels and no spaces in its name.
+SELECT name
+FROM world
+WHERE name NOT LIKE '% %' AND name LIKE '%a%' AND name LIKE '%e%' AND name LIKE '%i%'
+  AND name LIKE '%o%' AND name LIKE '%u%'