sql-zoo/q5.sql at master · michpara/sql-zoo · GitHub

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#SUM and COUNT

#Question 1
SELECT SUM(population)
  FROM world;

#Question 2
SELECT DISTINCT continent
  FROM world;

#Question 3
SELECT SUM(gdp)
  FROM world
 WHERE continent = 'Africa';

#Question 4
SELECT COUNT(name)
  FROM world
 WHERE area >= 1000000;

#Question 5
SELECT SUM(population)
  FROM world
 WHERE name IN ('Estonia', 'Latvia', 'Lithuania');

#Question 6
  SELECT continent, COUNT(name)
    FROM world
GROUP BY continent;

#Question 7
  SELECT continent, COUNT(name)
    FROM world
   WHERE population >= 10000000
GROUP BY continent;

#Question 8
  SELECT continent
    FROM world
GROUP BY continent
  HAVING SUM(population) >= 100000000;

#Quiz
1. C
2. A
3. D
4. E
5. B
6. E
7. D
8. D