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Move exercises into separate repositories
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Diff for: ‎01_select_basics.sql

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-- Spiderman Andew Garfield- NY accent
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-- 1. Show the population of Germany
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SELECT population
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FROM world
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WHERE name = 'Germany'
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-- 2. Show the per capita gdp: (gdp/population) for each country where the area
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-- is over 5,000,000 km^2
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SELECT name country, gdp/population per_capita_gdp
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FROM world
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WHERE area > 5000000
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-- 3. Show the name and continent where the area is less then 2000 and the gdp
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-- is more than 5000000000
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SELECT name country, continent
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FROM world
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WHERE area < 2000
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AND gdp > 5000000000
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-- 4. Show the name and the population for 'Denmark', 'Finland', 'Norway',
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-- 'Sweden'
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SELECT name country, population
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FROM world
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WHERE name IN ('Denmark', 'Finland', 'Norway', 'Sweden')
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-- 5. Show each country that begins with G
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SELECT name country
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FROM world
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WHERE name LIKE 'G%'
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-- 6. Show the area in 1000 square km. Show area/1000 instead of area
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SELECT name country, area/1000
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FROM world
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WHERE area BETWEEN 207600 AND 244820

Diff for: ‎02_select_from_world_tutorial.sql

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-- 1. Observe the result of running a simple SQL command.
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SELECT name country, continent, population
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FROM world
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-- 2. Show the name for the countries that have a population of at least 200
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-- million.
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SELECT name country
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FROM world
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WHERE population>200000000
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-- 3. Give the name and the per capita GDP for those countries with a
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-- population of at least 200 million.
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SELECT name country, gdp/population per_capita_gdp
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FROM world
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WHERE population > 200E6
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-- 4. Show the (name) and (population) in millions for the countries of
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-- 'South America' Divide the population by 1000000 to get population in
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-- millions.
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SELECT name country, population/1000000 pop_millions
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FROM world
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WHERE continent = 'South America'
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-- 5. Show the (name) and (population) for 'France', 'Germany', 'Italy'
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SELECT name country, population
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FROM world
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WHERE name IN ('France', 'Germany', 'Italy')
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-- 6. Identify the countries which have names including the word 'United'
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SELECT name country
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FROM world
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WHERE name LIKE '%United%'

Diff for: ‎03_select_from_nobel_tutorial.sql

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-- 1. Change the query shown so that it displays Nobel prizes for 1950.
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SELECT yr, subject, winner
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FROM nobel
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WHERE yr = 1950
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-- 2. Show who won the 1962 prize for Literature.
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SELECT winner winner_1962
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FROM nobel
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WHERE yr = 1962
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AND subject = 'Literature'
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-- 3. Show the year and subject that won 'Albert Einstein' his prize.
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SELECT yr, subject
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FROM nobel
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WHERE winner = 'Albert Einstein'
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-- 4. Give the name of the 'Peace' winners since the year 2000, including 2000.
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SELECT winner winner_peace
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FROM nobel
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WHERE subject = 'Peace'
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AND yr >= 2000
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-- 5. Show all details (yr, subject, winner) of the Literature prize winners for
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-- 1980 to 1989 inclusive.
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SELECT *
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FROM nobel
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WHERE subject = 'Literature'
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AND yr BETWEEN 1980 AND 1989
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-- 6. Show all details of the presidential winners: ('Theodore Roosevelt',
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-- 'Woodrow Wilson', 'Jed Bartlet', 'Jimmy Carter')
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SELECT *
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FROM nobel
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WHERE winner IN ('Theodore Roosevelt', 'Woodrow Wilson', 'Jed Bartlet',
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'Jimmy Carter')
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-- 7. Show the winners with first name John
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SELECT winner
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FROM nobel
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WHERE winner LIKE 'John%'
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-- 8. In which years was the Physics prize awarded but no Chemistry prize.
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-- (WARNING - this question is way too hard for this level, you will need to use
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-- sub queries or joins).
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SELECT DISTINCT p.yr
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FROM nobel p
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WHERE p.subject = 'Physics'
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AND p.yr NOT IN
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(
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SELECT c.yr
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FROM nobel c
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WHERE c.subject = 'Chemistry'
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)

Diff for: ‎04_select_within_select_tutorial.sql

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-- 1. List each country name where the population is larger than 'Russia'.
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SELECT name country
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FROM world
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WHERE population >
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(
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SELECT population FROM world
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WHERE name='Russia'
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)
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-- 2. List the name and continent of countries in the continents containing
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-- 'Belize', 'Belgium'.
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SELECT a.name country, a.continent
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FROM world a
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WHERE a.continent IN
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(
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SELECT b.continent
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FROM world b
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WHERE b.name IN ('Belize', 'Belgium')
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)
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-- 3. Show the countries in Europe with a per capita GDP greater than
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-- 'United Kingdom'.
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SELECT a.name country
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FROM world a
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WHERE a.continent = 'Europe'
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AND a.gdp/a.population >
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(
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SELECT b.gdp/b.population
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FROM world b
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WHERE b.name = 'United Kingdom'
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)
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-- 4. Which country has a population that is more than Canada but less than
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-- Poland? Show the name and the population.
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SELECT a.name country, a.population
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FROM world a
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WHERE a.population >
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(
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SELECT b.population
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FROM world b
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WHERE b.name = 'Canada'
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)
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AND a.population <
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(
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SELECT c.population
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FROM world c
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WHERE c.name = 'Poland'
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)
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-- 5. Which countries have a GDP greater than any country in Europe? [Give the
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-- name only.]
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SELECT a.name country
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FROM world a
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WHERE a.gdp > ALL
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(
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SELECT b.gdp
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FROM world b
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WHERE b.continent = 'Europe'
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)
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-- 6. Find the largest country (by area) in each continent, show the continent,
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-- the name and the area:
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SELECT continent, name country, area
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FROM world x
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WHERE area >= ALL
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(
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SELECT area FROM world y
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WHERE y.continent=x.continent
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AND area>0
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)
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-- 7. Find each country that belongs to a continent where all populations are
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-- less than 25000000. Show name, continent and population.
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SELECT a.name country, a.continent, a.population
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FROM world a
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WHERE 25000000 > ALL
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(
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SELECT b.population
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FROM world b
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WHERE a.continent = b.continent
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AND b.population > 0
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)
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-- 8. Some countries have populations more than three times that of any of their
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-- neighbours (in the same continent). Give the countries and continents.
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SELECT a.name country, a.continent
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FROM world a
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WHERE a.population > ALL
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(
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SELECT b.population*3
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FROM world b
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WHERE a.continent = b.continent
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AND a.name <> b.name
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)

Diff for: ‎05_sum_and_count.sql

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-- 1. Show the total population of the world.
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SELECT SUM(population) pop_world
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FROM world
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-- 2. List all the continents - just once each.
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SELECT DISTINCT continent
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FROM world
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-- 3. Give the total GDP of Africa
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SELECT SUM(gdp) gdp_Africa
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FROM world
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WHERE continent = 'Africa'
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-- 4. How many countries have an area of at least 1000000
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SELECT COUNT(name) num_countries
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FROM world
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WHERE area >= 1000000
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-- 5. What is the total population of ('France','Germany','Spain')
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SELECT SUM(population) total_pop
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FROM world
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WHERE name IN ('France','Germany','Spain')
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-- 6. For each continent show the continent and number of countries.
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SELECT continent, COUNT(name) num_countries
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FROM world
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GROUP BY continent
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-- 7. For each continent show the continent and number of countries with
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-- populations of at least 10 million.
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SELECT continent, COUNT(name) num_countries
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FROM world
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WHERE population >= 10E6
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GROUP BY continent
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-- 8. List the continents with total populations of at least 100 million.
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SELECT continent
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FROM world
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GROUP BY continent
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HAVING SUM(population) >= 100E6

Diff for: ‎06_the_join_operation.sql

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-- 1. Show matchid and player name for all goals scored by Germany.
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-- (teamid = 'GER')
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SELECT matchid, player
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FROM goal
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WHERE teamid = 'GER'
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-- 2. Show id, stadium, team1, team2 for game 1012
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SELECT id,stadium,team1,team2
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FROM game
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WHERE id = 1012
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-- 3. Show the player, teamid and mdate and for every German goal.
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-- (teamid='GER')
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SELECT player, teamid, mdate
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FROM game
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JOIN goal ON (game.id = goal.matchid)
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WHERE teamid = 'GER'
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-- 4. Show the team1, team2 and player for every goal scored by a player called
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-- Mario (player LIKE 'Mario%')
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SELECT team1, team2, player
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FROM goal
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JOIN game ON (game.id = goal.matchid)
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WHERE player LIKE 'Mario%'
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-- 5. Show (player), (teamid), (coach), (gtime) for all goals scored in the
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-- first 10 minutes (gtime<=10)
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SELECT player, teamid, coach, gtime
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FROM goal
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JOIN eteam ON (goal.teamid = eteam.id)
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WHERE gtime <= 10
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-- 6. List the the dates of the matches and the name of the team in which
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-- 'Fernando Santos' was the team1 coach.
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SELECT mdate, teamname
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FROM game
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JOIN eteam ON (game.team1 = eteam.id)
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WHERE coach = 'Fernando Santos'
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-- 7. List the player for every goal scored in a game where the staium was
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-- 'National Stadium, Warsaw'
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SELECT player
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FROM goal
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JOIN game ON (goal.matchid = game.id)
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WHERE stadium = 'National Stadium, Warsaw'
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-- 8. Show names of all players who scored a goal against Germany.
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SELECT DISTINCT player
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FROM game
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JOIN goal ON goal.matchid = game.id
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WHERE (team1 = 'GER' OR team2 = 'GER')
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AND teamid <> 'GER'
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-- 9. Show teamname and the total number of goals scored.
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SELECT teamname, COUNT(player) goals_scored
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FROM eteam JOIN goal ON eteam.id = goal.teamid
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GROUP BY teamname
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-- 10. Show the stadium and the number of goals scored in each stadium.
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SELECT stadium, COUNT(player) goals_scored
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FROM game
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JOIN goal ON game.id = goal.matchid
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GROUP BY stadium
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-- 11. For every match involving 'POL', show the matchid, date and the number of
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-- goals scored.
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SELECT matchid, mdate, COUNT(player) goals_scored
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FROM game
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JOIN goal ON goal.matchid = game.id
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WHERE (team1 = 'POL' OR team2 = 'POL')
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GROUP BY goal.matchid
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-- 12. For every match where 'GER' scored, show matchid, match date and the
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-- number of goals scored by 'GER'
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SELECT matchid, mdate, COUNT(player)
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FROM game
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JOIN goal ON game.id = goal.matchid
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WHERE teamid = 'GER'
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GROUP BY game.id
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-- 13. List every match with the goals scored by each team as shown.
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-- Sort your result by mdate, matchid, team1 and team2.
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SELECT mdate,
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team1,
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SUM(CASE WHEN teamid=team1 THEN 1 ELSE 0 END) score1,
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team2,
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SUM(CASE WHEN teamid=team2 THEN 1 ELSE 0 END) score2
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FROM game JOIN goal ON goal.matchid = game.id
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GROUP BY game.id
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ORDER BY mdate, matchid, team1, team2

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