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Data Manipulation in SQL

Here you can access every table used in the course. To access each table, you will need to specify the soccer schema in your queries (e.g., soccer.match for the match table, and soccer.league for the league table).

Note: When using sample integrations such as those that contain course data, you have read-only access. You can run queries, but cannot make any changes such as adding, deleting, or modifying the data (e.g., creating tables, views, etc.).

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DataFrameas
df1
variable
ELECT 
	c.name AS country,
    -- Sum the total records in each season where the home team won. For counting the number of home wins in a country  in three seasons
	SUM (CASE WHEN m.season = '2012/2013' AND m.home_goal > m.away_goal 
        THEN 1 ELSE 0 END) AS matches_2012_2013,
 	SUM (CASE WHEN m.season = '2013/2014' AND M.home_goal > m.away_goal 
        THEN 1 ELSE 0 END) AS matches_2013_2014,
	SUM (CASE WHEN m.season = '2014/2015' AND  m.home_goal > m.away_goal THEN 1 ELSE 0 END) AS matches_2014_2015
FROM country AS c
LEFT JOIN match AS m
ON c.id = m.country_id
-- Group by country name alias
GROUP BY country;

-- FR GWTTINNG PERCENTAGE HOME WINS
SELECT 
	c.name AS country,
    -- Calculate the percentage of tied games in each season
	AVG (CASE WHEN m.season='2013/2014' AND m.home_goal = m.away_goal THEN 1
			WHEN m.season='2013/2014' AND m.home_goal != m.away_goal THEN 0
			END) AS ties_2013_2014,
	AVG (CASE WHEN m.season='2014/2015' AND m.home_goal = m.away_goal THEN 1
			WHEN m.season='2014/2015' AND m.home_goal != m.away_goal THEN 0
			END) AS ties_2014_2015
FROM country AS c
LEFT JOIN matches AS m
ON c.id = m.country_id
GROUP BY country;

Take Notes

Add notes about the concepts you've learned and SQL cells with queries you want to keep.

Add your notes here

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DataFrameas
df
variable
-- Add your own queries here
SELECT *
FROM soccer.match
LIMIT 5

Explore Datasets

Use the match, league, and country tables to explore the data and practice your skills!

  • Use the match, league, and country tables to return the number of matches played in Great Britain versus elsewhere in the world.
    • "England", "Scotland", and "Wales" should be categorized as "Great Britain"
    • All other leagues will need to be categorized as "World".
  • Use the match and country tables to return the countries in which the average number of goals (home and away goals) scored are greater than the average number of goals of all matches.
  • In a soccer league, points are assigned to teams based on the result of a game. Here, let's assume that 3 points are awarded for a win, 1 for a tie, and 0 for a defeat. Use the match table to calculate the running total of points earned by the team "Chelsea" (team id 8455) in the season "2014/2015".
    • The final output should have the match date, the points earned by Chelsea, and the running total.