-- Selecting, ,ltering, and grouping data
SELECT user_id, SUM(sales)
FROM sales_data
WHERE user_id BETWEEN 300 AND 400
GROUP BY user_id;
-- Using joins
SELECT c.country, c.team, SUM(m.goals)
FROM countries AS c
LEFT JOIN matches AS m
ON c.team_id = m.home_team_id
WHERE m.year > 1990
GROUP BY c.country, c.team;
SELECT
l.name AS league,
COUNT(m.country_id) as matches
FROM league AS l
LEFT JOIN match AS m
ON l.country_id = m.country_id
GROUP BY l.name;
Run to view results
SELECT
date,
id,
home_goal,
away_goal
FROM match
WHERE season = '2013/2014';
Run to view results
SELECT
date,
id,
home_goal,
away_goal
FROM match
WHERE season = '2013/2014'
AND home_goal > away_goal;
Run to view results
CASE WHEN x = 1 THEN 'a'
WHEN x = 2 THEN 'b'
ELSE 'c' END AS new_column
SELECT
id,
home_goal,
away_goal,
CASE WHEN home_goal > away_goal THEN 'Home Team Win'
WHEN home_goal < away_goal THEN 'Away Team Win'
ELSE 'Tie' END AS outcome
FROM match
WHERE season = '2013/2014';
Run to view results
CREATE VIEW teams_germany AS
SELECT *
FROM team
WHERE team_api_id IN (9823, 9790, 8178, 9789, 10189, 9904, 8721, 8722, 9810, 8177, 8697, 8226, 9788, 10269, 8358, 8165, 9905, 8350, 8406, 8194, 8357, 9776, 8460);
CREATE VIEW matches_germany AS
SELECT *
FROM match
WHERE country_id = 7809
AND season IN ('2011/2012', '2012/2013', '2013/2014', '2014/2015');
Run to view results
SELECT
-- Select the team long name and team API id
team_long_name,
team_api_id
FROM teams_germany
-- Only include FC Schalke 04 and FC Bayern Munich
WHERE team_long_name IN ('FC Schalke 04', 'FC Bayern Munich');
Run to view results
-- Identify the home team as Bayern Munich, Schalke 04, or neither
SELECT
CASE WHEN hometeam_id = 10189 THEN 'FC Schalke 04'
WHEN hometeam_id = 9823 THEN 'FC Bayern Munich'
ELSE 'Other' END AS home_team,
COUNT(id) AS total_matches
FROM matches_germany
-- Group by the CASE statement alias
GROUP BY home_team;
Run to view results
CREATE VIEW teams_spain AS
SELECT *
FROM team
WHERE team_api_id IN (10267, 8661, 8371, 10205, 9783, 8633, 8634, 8696, 8302, 9869, 8305, 8603, 8558, 10281, 8315, 9865, 9906, 9864, 8394, 8581, 8560, 7878, 8370, 9910, 10268, 8372, 7869);
CREATE VIEW matches_spain AS
SELECT *
FROM match
WHERE country_id = 21518
AND season = '2011/2012';
Run to view results
SELECT
-- Select the date of the match
date,
-- Identify home wins, losses, or ties
CASE WHEN home_goal > away_goal THEN 'Home win!'
WHEN home_goal < away_goal THEN 'Home loss :('
ELSE 'Tie' END AS outcome
FROM matches_spain;
Run to view results
SELECT
m.date,
--Select the team long name column and call it 'opponent'
t.team_long_name AS opponent,
-- Complete the CASE statement with an alias
CASE WHEN m.home_goal > m.away_goal THEN 'Home win!'
WHEN m.home_goal < m.away_goal THEN 'Home loss :('
ELSE 'Tie' END AS outcome
FROM matches_spain AS m
-- Left join teams_spain onto matches_spain
LEFT JOIN teams_spain AS t
ON m.awayteam_id = t.team_api_id;
Run to view results
SELECT
m.date,
t.team_long_name AS opponent,
-- Complete the CASE statement with an alias
CASE WHEN m.home_goal > m.away_goal THEN 'Barcelona win!'
WHEN m.home_goal < m.away_goal THEN 'Barcelona loss :('
ELSE 'Tie' END AS outcome
FROM matches_spain AS m
LEFT JOIN teams_spain AS t
ON m.awayteam_id = t.team_api_id
-- Filter for Barcelona as the home team
WHERE m.hometeam_id = 8634;
Run to view results
-- Select matches where Barcelona was the away team
SELECT
m.date,
t.team_long_name AS opponent,
CASE WHEN m.home_goal < m.away_goal THEN 'Barcelona win!'
WHEN m.home_goal > m.away_goal THEN 'Barcelona loss :('
ELSE 'Tie' END AS outcome
FROM matches_spain AS m
-- Join teams_spain to matches_spain
LEFT JOIN teams_spain AS t
ON t.team_api_id = m.hometeam_id
WHERE m.awayteam_id = 8634;
Run to view results
SELECT
date,
season,
CASE WHEN home_goal > away_goal THEN 'Home team win!'
WHEN home_goal < away_goal THEN 'Away team win!'
ELSE 'Tie' END AS outcome
FROM match;
Run to view results
SELECT date, hometeam_id, awayteam_id,
CASE WHEN hometeam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea home win!'
WHEN awayteam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea away win!'
ELSE 'Loss or tie :(' END AS outcome
FROM match
WHERE hometeam_id = 8455 OR awayteam_id = 8455;
Run to view results
SELECT date, hometeam_id, awayteam_id,
CASE WHEN hometeam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea home win!'
WHEN awayteam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea away win!'
ELSE 'Loss or tie :(' END AS outcome
FROM match;
Run to view results
SELECT date, hometeam_id, awayteam_id,
CASE WHEN hometeam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea home win!'
WHEN awayteam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea away win!'
ELSE 'Loss or tie :(' END AS outcome
FROM match
WHERE hometeam_id = 8455 OR awayteam_id = 8455;
Run to view results
SELECT date,
CASE WHEN date > '2015-01-01' THEN 'More Recently'
WHEN date < '2012-01-01' THEN 'Older'
END AS date_category
FROM match;
Run to view results
SELECT date,
CASE WHEN date > '2015-01-01' THEN 'More Recently'
WHEN date < '2012-01-01' THEN 'Older'
ELSE NULL END AS date_category
FROM match;
Run to view results
SELECT date, season,
CASE WHEN hometeam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea home win!'
WHEN awayteam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea away win!'
END AS outcome
FROM match
WHERE hometeam_id = 8455 OR awayteam_id = 8455;
Run to view results
SELECT date, season,
CASE WHEN hometeam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea home win!'
WHEN awayteam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea away win!' END AS outcome
FROM match
WHERE CASE WHEN hometeam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea home win!'
WHEN awayteam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea away win!' END IS NOT NULL;
Run to view results
CREATE VIEW matches_spain2 AS
SELECT * FROM match
WHERE country_id = 21518 AND season IN ('2011/2012', '2012/2013', '2013/2014', '2014/2015');
Run to view results
SELECT
date,
-- Identify the home team as Barcelona or Real Madrid
CASE WHEN hometeam_id = 8634 THEN 'FC Barcelona'
ELSE 'Real Madrid CF' END AS home,
-- Identify the away team as Barcelona or Real Madrid
CASE WHEN awayteam_id = 8634 THEN 'FC Barcelona'
ELSE 'Real Madrid CF' END AS away
FROM matches_spain2
WHERE (awayteam_id = 8634 OR hometeam_id = 8634)
AND (awayteam_id = 8633 OR hometeam_id = 8633);
Run to view results
SELECT
date,
CASE WHEN hometeam_id = 8634 THEN 'FC Barcelona'
ELSE 'Real Madrid CF' END as home,
CASE WHEN awayteam_id = 8634 THEN 'FC Barcelona'
ELSE 'Real Madrid CF' END as away,
-- Identify all possible match outcomes
CASE WHEN home_goal > away_goal AND hometeam_id = 8634 THEN 'Barcelona win!'
WHEN home_goal > away_goal AND hometeam_id = 8633 THEN 'Real Madrid win!'
WHEN home_goal < away_goal AND awayteam_id = 8634 THEN 'Barcelona win!'
WHEN home_goal < away_goal AND awayteam_id = 8633 THEN 'Real Madrid win!'
ELSE 'Tie!' END AS outcome
FROM matches_spain2
WHERE (awayteam_id = 8634 OR hometeam_id = 8634)
AND (awayteam_id = 8633 OR hometeam_id = 8633);
Run to view results
CREATE VIEW teams_italy AS
SELECT *
FROM team
WHERE team_api_id IN (8524, 8551, 8529, 8543, 8530, 10233, 8533, 8535, 9885, 8564, 9857, 8686, 9875, 9882, 8636, 9804, 9888, 8600, 8540, 8537, 10167, 9880, 6269, 9878, 9876, 7943, 8534);
CREATE VIEW matches_italy AS
SELECT * FROM match
WHERE country_id = 10257 AND season IN ('2011/2012', '2012/2013', '2013/2014', '2014/2015');
Run to view results
-- Select team_long_name and team_api_id from team
SELECT
team_long_name,
team_api_id
FROM teams_italy
-- Filter for team long name
WHERE team_long_name = 'Bologna';
Run to view results
-- Select the season and date columns
SELECT
season,
date,
-- Identify when Bologna won a match
CASE WHEN hometeam_id = 9857
AND home_goal > away_goal
THEN 'Bologna Win'
WHEN awayteam_id = 9857
AND away_goal > home_goal
THEN 'Bologna Win'
END AS outcome
FROM matches_italy;
Run to view results
-- Select the season, date, home_goal, and away_goal columns
SELECT
season,
date,
home_goal,
away_goal
FROM matches_italy
WHERE
-- Exclude games not won by Bologna
CASE WHEN hometeam_id = 9857 AND home_goal > away_goal THEN 'Bologna Win'
WHEN awayteam_id = 9857 AND away_goal > home_goal THEN 'Bologna Win'
END IS NOT NULL;
Run to view results
SELECT
season,
COUNT(CASE WHEN hometeam_id = 8650 AND home_goal > away_goal
THEN id END) AS home_wins,
COUNT(CASE WHEN awayteam_id = 8650 AND away_goal > home_goal
THEN id END) AS away_wins
FROM match
GROUP BY season;
Run to view results
SELECT
season,
COUNT(CASE WHEN hometeam_id = 8650 AND home_goal > away_goal
THEN 54321 END) AS home_wins,
COUNT(CASE WHEN awayteam_id = 8650 AND away_goal > home_goal
THEN 'Some random text' END) AS away_wins
FROM match
GROUP BY season;
Run to view results
SELECT
season,
SUM(CASE WHEN hometeam_id = 8650
THEN home_goal END) AS home_goals,
SUM(CASE WHEN awayteam_id = 8650
THEN away_goal END) AS away_goals
FROM match
GROUP BY season;
Run to view results
SELECT
season,
AVG(CASE WHEN hometeam_id = 8650
THEN home_goal END) AS home_goals,
AVG(CASE WHEN awayteam_id = 8650
THEN away_goal END) AS away_goals
FROM match
GROUP BY season;
Run to view results
SELECT
season,
ROUND(AVG(CASE WHEN hometeam_id = 8650
THEN home_goal END),2) AS home_goals,
ROUND(AVG(CASE WHEN awayteam_id = 8650
THEN away_goal END),2) AS away_goals
FROM match
GROUP BY season;
Run to view results
SELECT
season,
AVG(CASE WHEN hometeam_id = 8455 AND home_goal > away_goal THEN 1
WHEN hometeam_id = 8455 AND home_goal < away_goal THEN 0
END) AS pct_homewins,
AVG(CASE WHEN awayteam_id = 8455 AND away_goal > home_goal THEN 1
WHEN awayteam_id = 8455 AND away_goal < home_goal THEN 0
END) AS pct_awaywins
FROM match
GROUP BY season;
Run to view results
SELECT
season,
ROUND(AVG(CASE WHEN hometeam_id = 8455 AND home_goal > away_goal THEN 1
WHEN hometeam_id = 8455 AND home_goal < away_goal THEN 0
END), 2) AS pct_homewins,
ROUND(AVG(CASE WHEN awayteam_id = 8455 AND away_goal > home_goal THEN 1
WHEN awayteam_id = 8455 AND away_goal < home_goal THEN 0
END), 2) AS pct_awaywins
FROM match
GROUP BY season;
Run to view results
SELECT
c.name AS country,
-- Count games from the 2012/2013 season
COUNT(CASE WHEN m.season = '2012/2013'
THEN m.id ELSE NULL END) AS matches_2012_2013
FROM country AS c
LEFT JOIN match AS m
ON c.id = m.country_id
-- Group by country name alias
GROUP BY country;
Run to view results
SELECT
c.name AS country,
-- Count matches in each of the 3 seasons
COUNT(CASE WHEN m.season = '2012/2013' THEN m.id END) AS matches_2012_2013,
COUNT(CASE WHEN m.season = '2013/2014' THEN m.id END) AS matches_2013_2014,
COUNT(CASE WHEN m.season = '2014/2015' THEN m.id 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;
Run to view results
SELECT
c.name AS country,
-- Sum the total records in each season where the home team won
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;
Run to view results
SELECT
c.name AS country,
-- Count the home wins, away wins, and ties in each country
COUNT(CASE WHEN m.home_goal > m.away_goal THEN m.id
END) AS home_wins,
COUNT(CASE WHEN m.home_goal < m.away_goal THEN m.id
END) AS away_wins,
COUNT(CASE WHEN m.home_goal = m.away_goal THEN m.id
END) AS ties
FROM country AS c
LEFT JOIN match AS m
ON c.id = m.country_id
GROUP BY country;
Run to view results
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 match AS m
ON c.id = m.country_id
GROUP BY country;
Run to view results
SELECT
c.name AS country,
-- Round the percentage of tied games to 2 decimal points
ROUND(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),2) AS pct_ties_2013_2014,
ROUND(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),2) AS pct_ties_2014_2015
FROM country AS c
LEFT JOIN match AS m
ON c.id = m.country_id
GROUP BY country;
Run to view results
SELECT column
FROM (SELECT column
FROM table) AS subquery;
Run to view results
SELECT home_goal
FROM match
WHERE home_goal > (
SELECT AVG(home_goal)
FROM match);
Run to view results
SELECT AVG(home_goal) FROM match;
Run to view results
SELECT AVG(home_goal) FROM match;
Run to view results
SELECT date, hometeam_id, awayteam_id, home_goal, away_goal
FROM match
WHERE season = '2012/2013'
AND home_goal > 1.54459371;
Run to view results
SELECT date, hometeam_id, awayteam_id, home_goal, away_goal
FROM match
WHERE season = '2012/2013'
AND home_goal > (SELECT AVG(home_goal)
FROM match);
Run to view results
SELECT
team_long_name,
team_short_name AS abbr
FROM team
WHERE
team_api_id IN
(SELECT hometeam_id
FROM match
WHERE country_id = 15722);
Run to view results
CREATE VIEW matches_2013_2014 AS
SELECT *
FROM match
WHERE season = '2013/2014'
Run to view results
-- Select the average of home + away goals, multiplied by 3
SELECT
3 * AVG(home_goal + away_goal)
FROM matches_2013_2014;
Run to view results
SELECT
-- Select the date, home goals, and away goals scored
date,
home_goal,
away_goal
FROM matches_2013_2014
-- Filter for matches where total goals exceeds 3x the average
WHERE (home_goal + away_goal) >
(SELECT 3 * AVG(home_goal + away_goal)
FROM matches_2013_2014);
Run to view results
CREATE VIEW match11_15 AS
SELECT *
FROM match
WHERE season IN ('2011/2012', '2012/2013', '2013/2014', '2014/2015');
Run to view results
SELECT
-- Select the team long and short names
team_long_name,
team_short_name
FROM team
-- Exclude all values from the subquery
WHERE team_api_id NOT IN
(SELECT DISTINCT hometeam_id FROM match11_15);
Run to view results
SELECT
-- Select the team long and short names
team_long_name,
team_short_name
FROM team
-- Filter for teams with 8 or more home goals
WHERE team_api_id IN
(SELECT hometeam_ID
FROM match
WHERE home_goal >= 8);
Run to view results
SELECT
t.team_long_name AS team,
AVG(m.home_goal) AS home_avg
FROM match AS m
LEFT JOIN team AS t
ON m.hometeam_id = t.team_api_id
WHERE season = '2011/2012'
GROUP BY team;
Run to view results
SELECT team, home_avg
FROM (SELECT
t.team_long_name AS team,
AVG(m.home_goal) AS home_avg
FROM match AS m
LEFT JOIN team AS t
ON m.hometeam_id = t.team_api_id
WHERE season = '2011/2012'
GROUP BY team) AS subquery
ORDER BY home_avg DESC
LIMIT 3;
Run to view results
SELECT
-- Select the country ID and match ID
id,
country_id
FROM match
-- Filter for matches with 10 or more goals in total
WHERE (home_goal + away_goal) >= 10;
Run to view results
SELECT
-- Select country name and the count match IDs
c.name AS country_name,
COUNT(sub.id) AS matches
FROM country AS c
-- Inner join the subquery onto country
-- Select the country id and match id columns
INNER JOIN (SELECT country_id, id
FROM match
-- Filter the subquery by matches with 10+ goals
WHERE (home_goal + away_goal) >= 10) AS sub
ON c.id = sub.country_id
GROUP BY country_name;
Run to view results
SELECT
-- Select country, date, home, and away goals from the subquery
country,
date,
home_goal,
away_goal
FROM
-- Select country name, date, home_goal, away_goal, and total goals in the subquery
(SELECT name AS country,
m.date,
m.home_goal,
m.away_goal,
(m.home_goal + m.away_goal) AS total_goals
FROM match AS m
LEFT JOIN country AS c
ON m.country_id = c.id) AS subq
-- Filter by total goals scored in the main query
WHERE total_goals >= 10;
Run to view results
SELECT COUNT(id) FROM match;
Run to view results
SELECT
season,
COUNT(id) AS matches,
12837 as total_matches
FROM match
GROUP BY season;
Run to view results
SELECT
season,
COUNT(id) AS matches,
(SELECT COUNT(id) FROM match) as total_matches
FROM match
GROUP BY season;
Run to view results
SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
(home_goal + away_goal) - 2.72 AS diff
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
(home_goal + away_goal) -
(SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2011/2012') AS diff
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
(home_goal + away_goal) -
(SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2011/2012') AS diff
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
l.name AS league,
-- Select and round the league's total goals
ROUND(AVG(m.home_goal + m.away_goal), 2) AS avg_goals,
-- Select & round the average total goals for the season
(SELECT ROUND(AVG(home_goal + away_goal), 2)
FROM match
WHERE season = '2013/2014') AS overall_avg
FROM league AS l
LEFT JOIN match AS m
ON l.country_id = m.country_id
-- Filter for the 2013/2014 season
WHERE season = '2013/2014'
GROUP BY l.name;
Run to view results
SELECT
-- Select the league name and average goals scored
l.name AS league,
ROUND(AVG(m.home_goal + m.away_goal),2) AS avg_goals,
-- Subtract the overall average from the league average
ROUND(AVG(m.home_goal + m.away_goal) -
(SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2013/2014'),2) AS diff
FROM league AS l
LEFT JOIN match AS m
ON l.country_id = m.country_id
-- Only include 2013/2014 results
WHERE season = '2013/2014'
GROUP BY league;
Run to view results
SELECT
country_id,
ROUND(AVG(matches.home_goal + matches.away_goal),2) AS avg_goals,
(SELECT ROUND(AVG(home_goal + away_goal),2)
FROM match WHERE season = '2013/2014') AS overall_avg
FROM (SELECT
id,
home_goal,
away_goal,
season
FROM match
WHERE home_goal > 5) AS matches
WHERE matches.season = '2013/2014'
AND (AVG(matches.home_goal + matches.away_goal) >
(SELECT AVG(home_goal + away_goal)
FROM match WHERE season = '2013/2014')
GROUP BY country_id;
Run to view results
SELECT
col1,
col2,
col3
FROM table1
WHERE col1 = 2;
Run to view results
/* This query filters for col1 = 2
and only selects data from table1 */
SELECT
col1,
col2,
col3
FROM table1 -- this table has 10,000 rows
WHERE col1 = 2; -- Filter WHERE value 2
Run to view results
SELECT
col1,
col2,
col3
FROM table1
WHERE col1 IN
(SELECT id
FROM table2
WHERE year = 1991);
Run to view results
SELECT
date,
hometeam_id,
awayteam_id,
CASE WHEN hometeam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea home win'
WHEN awayteam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea away win'
WHEN hometeam_id = 8455 AND home_goal < away_goal
THEN 'Chelsea home loss'
WHEN awayteam_id = 8455 AND home_goal > away_goal
THEN 'Chelsea away loss'
WHEN (hometeam_id = 8455 OR awayteam_id = 8455)
AND home_goal = away_goal THEN 'Chelsea Tie'
END AS outcome
FROM match
WHERE hometeam_id = 8455 OR awayteam_id = 8455;
Run to view results
SELECT
country_id,
ROUND(AVG(m.home_goal + m.away_goal),2) AS avg_goals,
(SELECT ROUND(AVG(home_goal + away_goal),2)
FROM match WHERE season = '2013/2014') AS overall_avg
FROM match AS m
WHERE
m.season = '2013/2014'
AND (AVG(m.home_goal + m.away_goal) >
(SELECT AVG(home_goal + away_goal)
FROM match WHERE season = '2013/2014')
GROUP BY country_id;
Run to view results
SELECT
-- Select the stage and average goals for each stage
m.stage,
ROUND(AVG(m.home_goal + m.away_goal),2) AS avg_goals,
-- Select the average overall goals for the 2012/2013 season
ROUND((SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2012/2013'),2) AS overall
FROM match AS m
-- Filter for the 2012/2013 season
WHERE season = '2012/2013'
-- Group by stage
GROUP BY m.stage;
Run to view results
SELECT
-- Select the stage and average goals from the subquery
s.stage,
ROUND(s.avg_goals,2) AS avg_goals
FROM
-- Select the stage and average goals in 2012/2013
(SELECT
stage,
AVG(home_goal + away_goal) AS avg_goals
FROM match
WHERE season = '2012/2013'
GROUP BY stage) AS s
WHERE
-- Filter the main query using the subquery
s.avg_goals > (SELECT AVG(home_goal + away_goal)
FROM match WHERE season = '2012/2013');
Run to view results
SELECT
-- Select the stage and average goals from s
s.stage,
ROUND(s.avg_goals,2) AS avg_goal,
-- Select the overall average for 2012/2013
(SELECT AVG(home_goal + away_goal) FROM match WHERE season = '2012/2013') AS overall_avg
FROM
-- Select the stage and average goals in 2012/2013 from match
(SELECT
stage,
AVG(home_goal + away_goal) AS avg_goals
FROM match
WHERE season = '2012/2013'
GROUP BY stage) AS s
WHERE
-- Filter the main query using the subquery
s.avg_goals > (SELECT AVG(home_goal + away_goal)
FROM match WHERE season = '2012/2013');
Run to view results
SELECT
s.stage,
ROUND(s.avg_goals,2) AS avg_goal,
(SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2012/2013') AS overall_avg
FROM (SELECT
stage,
AVG(home_goal + away_goal) AS avg_goals
FROM match
WHERE season = '2012/2013'
GROUP BY stage) AS s -- Subquery in FROM
WHERE s.avg_goals > (SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2012/2013'); -- Subquery in WHERE
Run to view results
SELECT
s.stage,
ROUND(s.avg_goals,2) AS avg_goal,
(SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2012/2013') AS overall_avg
FROM
(SELECT
stage,
AVG(home_goal + away_goal) AS avg_goals
FROM match
WHERE season = '2012/2013'
GROUP BY stage) AS s
WHERE s.avg_goals > (SELECT AVG(home_goal + away_goal)
FROM match AS m
WHERE s.stage > m.stage);
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SELECT
c.name AS country,
AVG(m.home_goal + m.away_goal)
AS avg_goals
FROM country AS c
LEFT JOIN match AS m
ON c.id = m.country_id
GROUP BY country;
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SELECT
c.name AS country,
(SELECT
AVG(home_goal + away_goal)
FROM match AS m
WHERE m.country_id = c.id)
AS avg_goals
FROM country AS c
GROUP BY country;
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SELECT
-- Select country ID, date, home, and away goals from match
main.country_id,
main.date,
main.home_goal,
main.away_goal
FROM match AS main
WHERE
-- Filter the main query by the subquery
(home_goal + away_goal) >
(SELECT AVG((sub.home_goal + sub.away_goal) * 3)
FROM match AS sub
-- Join the main query to the subquery in WHERE
WHERE main.country_id = sub.country_id);
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SELECT
-- Select country ID, date, home, and away goals from match
main.country_id,
main.date,
main.home_goal,
main.away_goal
FROM match AS main
WHERE
-- Filter for matches with the highest number of goals scored
(home_goal + away_goal) =
(SELECT MAX(sub.home_goal + sub.away_goal)
FROM match AS sub
WHERE sub.country_id = main.country_id
AND sub.season = main.season);
Run to view results
SELECT
c.name AS country,
AVG(m.home_goal + m.away_goal) AS avg_goals,
AVG(m.home_goal + m.away_goal) -
(SELECT AVG(home_goal + away_goal)
FROM match) AS avg_diff
FROM country AS c
LEFT JOIN match AS m
ON c.id = m.country_id
GROUP BY country;
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SELECT
EXTRACT(MONTH FROM date) AS month,
SUM(m.home_goal + m.away_goal) AS total_goals,
SUM(m.home_goal + m.away_goal) -
(SELECT AVG(goals)
FROM (SELECT
EXTRACT(MONTH FROM date) AS month,
SUM(home_goal + away_goal) AS goals
FROM match
GROUP BY month) AS s) AS avg_diff
FROM match AS m
GROUP BY month;
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SELECT
EXTRACT(MONTH from date) AS month,
SUM(home_goal + away_goal) AS goals
FROM match
GROUP BY month;
Run to view results
SELECT AVG(goals)
FROM (SELECT
EXTRACT(MONTH from date) AS month,
AVG(home_goal + away_goal) AS goals
FROM match
GROUP BY month) AS s;
Run to view results
SELECT
EXTRACT(MONTH FROM date) AS month,
SUM(m.home_goal + m.away_goal) AS total_goals,
SUM(m.home_goal + m.away_goal) -
(SELECT AVG(goals)
FROM (SELECT
EXTRACT(MONTH FROM date) AS month,
SUM(home_goal + away_goal) AS goals
FROM match
GROUP BY month) AS s) AS diff
FROM match AS m
GROUP BY month
LIMIT 4;
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SELECT
c.name AS country,
(SELECT AVG(home_goal + away_goal)
FROM match AS m
WHERE m.country_id = c.id -- Correlates with main query
AND id IN (
SELECT id -- Begin inner subquery
FROM match
WHERE season = '2011/2012')) AS avg_goals
FROM country AS c
GROUP BY country;
Run to view results
Run to view results
SELECT
-- Select the season and max goals scored in a match
season,
MAX(home_goal + away_goal) AS max_goals,
-- Select the overall max goals scored in a match
(SELECT MAX(home_goal + away_goal) FROM match) AS overall_max_goals,
-- Select the max number of goals scored in any match in July
(SELECT MAX(home_goal + away_goal)
FROM match
WHERE id IN (
SELECT id FROM match WHERE EXTRACT(MONTH FROM date) = 07)) AS july_max_goals
FROM match
GROUP BY season;
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-- Select matches where a team scored 5+ goals
SELECT
country_id,
season,
id
FROM match
WHERE home_goal >= 5 OR away_goal >= 5;
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-- Count match ids
SELECT
country_id,
season,
COUNT(id) AS matches
-- Set up and alias the subquery
FROM (
SELECT
country_id,
season,
id
FROM match
WHERE home_goal >= 5 OR away_goal >= 5)
AS subquery
-- Group by country_id and season
GROUP BY country_id, season;
Run to view results
SELECT
c.name AS country,
-- Calculate the average matches per season
AVG(outer_s.matches) AS avg_seasonal_high_scores
FROM country AS c
-- Left join outer_s to country
LEFT JOIN (
SELECT country_id, season,
COUNT(id) AS matches
FROM (
SELECT country_id, season, id
FROM match
WHERE home_goal >= 5 OR away_goal >= 5) AS inner_s
-- Close parentheses and alias the subquery
GROUP BY country_id, season) AS outer_s
ON c.id = outer_s.country_id
GROUP BY country;
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WITH cte AS (
SELECT col1, col2
FROM table)
SELECT
AVG(col1) AS avg_col
FROM cte;
Run to view results
SELECT
c.name AS country,
COUNT(s.id) AS matches
FROM country AS c
INNER JOIN (
SELECT country_id, id
FROM match
WHERE (home_goal + away_goal) >= 10) AS s
ON c.id = s.country_id
GROUP BY country;
Run to view results
WITH s AS (
SELECT country_id, id
FROM match
WHERE (home_goal + away_goal) >= 10
)
Run to view results
WITH s AS (
SELECT country_id, id
FROM match
WHERE (home_goal + away_goal) >= 10
)
SELECT
c.name AS country,
COUNT(s.id) AS matches
FROM country AS c
INNER JOIN s
ON c.id = s.country_id
GROUP BY country;
Run to view results
WITH s1 AS (
SELECT country_id, id
FROM match
WHERE (home_goal + away_goal) >= 10
),
s2 AS ( -- New subquery
SELECT country_id, id
FROM match
WHERE (home_goal + away_goal) <= 1
)
SELECT
c.name AS country,
COUNT(s1.id) AS high_scores,
COUNT(s2.id) AS low_scores -- New column
FROM country AS c
INNER JOIN s1
ON c.id = s1.country_id
INNER JOIN s2 -- New join
ON c.id = s2.country_id
GROUP BY country;
Run to view results
-- Set up your CTE
WITH match_list AS (
SELECT
country_id,
id
FROM match
WHERE (home_goal + away_goal) >= 10)
-- Select league and count of matches from the CTE
SELECT
l.name AS league,
COUNT(match_list.id) AS matches
FROM league AS l
-- Join the CTE to the league table
LEFT JOIN match_list ON l.id = match_list.country_id
GROUP BY l.name;
Run to view results
-- Set up your CTE
WITH match_list AS (
-- Select the league, date, home, and away goals
SELECT
l.name AS league,
m.date,
m.home_goal,
m.away_goal,
(m.home_goal + m.away_goal) AS total_goals
FROM match AS m
LEFT JOIN league as l ON m.country_id = l.id)
-- Select the league, date, home, and away goals from the CTE
SELECT league, date, home_goal, away_goal
FROM match_list
-- Filter by total goals
WHERE total_goals >= 10;
Run to view results
-- Set up your CTE
WITH match_list AS (
SELECT
country_id,
(home_goal + away_goal) AS goals
FROM match
-- Create a list of match IDs to filter data in the CTE
WHERE id IN (
SELECT id
FROM match
WHERE season = '2013/2014' AND EXTRACT(MONTH FROM date) = 8))
-- Select the league name and average of goals in the CTE
SELECT
l.name,
AVG(goals)
FROM league AS l
-- Join the CTE onto the league table
LEFT JOIN match_list ON l.id = match_list.country_id
GROUP BY l.name;
Run to view results
SELECT
m.id,
t.team_long_name AS hometeam
-- Left join team to match
FROM match AS m
LEFT JOIN team as t
ON m.hometeam_id = team_api_id;
Run to view results
SELECT
m.date,
-- Get the home and away team names
home.hometeam,
away.awayteam,
m.home_goal,
m.away_goal
FROM match AS m
-- Join the home subquery to the match table
LEFT JOIN (
SELECT match.id, team.team_long_name AS hometeam
FROM match
LEFT JOIN team
ON match.hometeam_id = team.team_api_id) AS home
ON home.id = m.id
-- Join the away subquery to the match table
LEFT JOIN (
SELECT match.id, team.team_long_name AS awayteam
FROM match
LEFT JOIN team
-- Get the away team ID in the subquery
ON match.awayteam_id = team.team_api_id) AS away
ON away.id = m.id;
Run to view results
SELECT
m.date,
(SELECT team_long_name
FROM team AS t
-- Connect the team to the match table
WHERE t.team_api_id = m.hometeam_id) AS hometeam
FROM match AS m;
Run to view results
SELECT
m.date,
(SELECT team_long_name
FROM team AS t
WHERE t.team_api_id = m.hometeam_id) AS hometeam,
-- Connect the team to the match table
(SELECT team_long_name
FROM team AS t
WHERE t.team_api_id = m.awayteam_id) AS awayteam,
-- Select home and away goals
m.home_goal,
m.away_goal
FROM match AS m;
Run to view results
SELECT
-- Select match id and team long name
m.id,
t.team_long_name AS hometeam
FROM match AS m
-- Join team to match using team_api_id and hometeam_id
LEFT JOIN team AS t
ON m.hometeam_id = t.team_api_id;
Run to view results
-- Declare the home CTE
WITH home AS (
SELECT m.id, t.team_long_name AS hometeam
FROM match AS m
LEFT JOIN team AS t
ON m.hometeam_id = t.team_api_id)
-- Select everything from home
SELECT *
FROM home;
Run to view results
WITH home AS (
SELECT m.id, m.date,
t.team_long_name AS hometeam, m.home_goal
FROM match AS m
LEFT JOIN team AS t
ON m.hometeam_id = t.team_api_id),
-- Declare and set up the away CTE
away AS (
SELECT m.id, m.date,
t.team_long_name AS awayteam, m.away_goal
FROM match AS m
LEFT JOIN team AS t
ON m.awayteam_id = t.team_api_id)
-- Select date, home_goal, and away_goal
SELECT
home.date,
home.hometeam,
away.awayteam,
home.home_goal,
away.away_goal
-- Join away and home on the id column
FROM home
INNER JOIN away
ON home.id = away.id;
Run to view results
SELECT
country_id,
season,
date,
AVG(home_goal) AS avg_home
FROM match
GROUP BY country_id;
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
(SELECT AVG(home_goal + away_goal)
FROM match
WHERE season = '2011/2012') AS overall_avg
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
AVG(home_goal + away_goal) OVER() AS overall_avg
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
RANK() OVER(ORDER BY home_goal + away_goal) AS goals_rank
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
RANK() OVER(ORDER BY home_goal + away_goal DESC) AS goals_rank
FROM match
WHERE season = '2011/2012';
Run to view results
SELECT
-- Select the id, country name, season, home, and away goals
m.id,
c.name AS country,
m.season,
m.home_goal,
m.away_goal,
-- Use a window to include the aggregate average in each row
AVG(m.home_goal + m.away_goal) OVER() AS overall_avg
FROM match AS m
LEFT JOIN country AS c ON m.country_id = c.id;
Run to view results
SELECT
-- Select the league name and average goals scored
l.name AS league,
AVG(m.home_goal + m.away_goal) AS avg_goals,
-- Rank each league according to the average goals
RANK() OVER(ORDER BY AVG(m.home_goal + m.away_goal)) AS league_rank
FROM league AS l
LEFT JOIN match AS m
ON l.id = m.country_id
WHERE m.season = '2011/2012'
GROUP BY l.name
-- Order the query by the rank you created
ORDER BY league_rank;
Run to view results
SELECT
-- Select the league name and average goals scored
l.name AS league,
AVG(m.home_goal + m.away_goal) AS avg_goals,
-- Rank leagues in descending order by average goals
RANK() OVER(ORDER BY AVG(m.home_goal + m.away_goal) DESC) AS league_rank
FROM league AS l
LEFT JOIN match AS m
ON l.id = m.country_id
WHERE m.season = '2011/2012'
GROUP BY l.name
-- Order the query by the rank you created
ORDER BY league_rank;
Run to view results
AVG(home_goal) OVER(PARTITION BY season)
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
AVG(home_goal + away_goal) OVER() AS overall_avg
FROM match;
Run to view results
SELECT
date,
(home_goal + away_goal) AS goals,
AVG(home_goal + away_goal) OVER(PARTITION BY season) AS season_avg
FROM match;
Run to view results
SELECT
c.name,
m.season,
(home_goal + away_goal) AS goals,
AVG(home_goal + away_goal)
OVER(PARTITION BY m.season, c.name) AS season_ctry_avg
FROM country AS c
LEFT JOIN match AS m
ON c.id = m.country_id;
Run to view results
SELECT
date,
season,
home_goal,
away_goal,
CASE WHEN hometeam_id = 8673 THEN 'home'
ELSE 'away' END AS warsaw_location,
-- Calculate the average goals scored partitioned by season
AVG(home_goal) OVER(PARTITION BY season) AS season_homeavg,
AVG(away_goal) OVER(PARTITION BY season) AS season_awayavg
FROM match
-- Filter the data set for Legia Warszawa matches only
WHERE
hometeam_id = 8673
OR awayteam_id = 8673
ORDER BY (home_goal + away_goal) DESC;
Run to view results
SELECT
date,
season,
home_goal,
away_goal,
CASE WHEN hometeam_id = 8673 THEN 'home'
ELSE 'away' END AS warsaw_location,
-- Calculate average goals partitioned by season and month
AVG(home_goal) OVER(PARTITION BY season,
EXTRACT(month FROM date)) AS season_mo_home,
AVG(away_goal) OVER(PARTITION BY season,
EXTRACT(month FROM date)) AS season_mo_away
FROM match
WHERE
hometeam_id = 8673
OR awayteam_id = 8673
ORDER BY (home_goal + away_goal) DESC;
Run to view results
-- Manchester City Home Games
SELECT
date,
home_goal,
away_goal,
SUM(home_goal)
OVER(ORDER BY date ROWS BETWEEN
UNBOUNDED PRECEDING AND CURRENT ROW) AS running_total
FROM match
WHERE hometeam_id = 8456 AND season = '2011/2012';
Run to view results
-- Manchester City Home Games
SELECT date,
home_goal,
away_goal,
SUM(home_goal)
OVER(ORDER BY date
ROWS BETWEEN 1 PRECEDING
AND CURRENT ROW) AS last2
FROM match
WHERE hometeam_id = 8456
AND season = '2011/2012';
Run to view results
SELECT
date,
home_goal,
away_goal,
-- Create a running total and running average of home goals
SUM(home_goal) OVER(ORDER BY date
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS running_total,
AVG(home_goal) OVER(ORDER BY date
ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS running_avg
FROM match
WHERE
hometeam_id = 9908
AND season = '2011/2012';
Run to view results
SELECT
-- Select the date, home goal, and away goals
date,
home_goal,
away_goal,
-- Create a running total and running average of home goals
SUM(home_goal) OVER(ORDER BY date DESC
ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS running_total,
AVG(home_goal) OVER(ORDER BY date DESC
ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS running_avg
FROM match
WHERE
awayteam_id = 9908
AND season = '2011/2012';
Run to view results
SELECT
m.id,
t.team_long_name,
-- Identify matches as home/away wins or ties
CASE WHEN m.home_goal > m.away_goal THEN 'MU Win'
WHEN m.home_goal < m.away_goal THEN 'MU Loss'
ELSE 'Tie' END AS outcome
FROM match AS m
-- Left join team on the home team ID and team API id
LEFT JOIN team AS t
ON m.hometeam_id = t.team_api_id
WHERE
-- Filter for 2014/2015 and Manchester United as the home team
season = '2014/2015'
AND t.team_long_name = 'Manchester United';
Run to view results
SELECT
m.id,
t.team_long_name,
-- Identify matches as home/away wins or ties
CASE WHEN m.home_goal > m.away_goal THEN 'MU Loss'
WHEN m.home_goal < m.away_goal THEN 'MU Win'
ELSE 'Tie' END AS outcome
-- Join team table to the match table
FROM match AS m
LEFT JOIN team AS t
ON m.awayteam_id = t.team_api_id
WHERE
-- Filter for 2014/2015 and Manchester United as the away team
season = '2014/2015'
AND t.team_long_name = 'Manchester United';
Run to view results
-- Set up the home team CTE
WITH home AS (
SELECT m.id, t.team_long_name,
CASE WHEN m.home_goal > m.away_goal THEN 'MU Win'
WHEN m.home_goal < m.away_goal THEN 'MU Loss'
ELSE 'Tie' END AS outcome
FROM match AS m
LEFT JOIN team AS t ON m.hometeam_id = t.team_api_id),
-- Set up the away team CTE
away AS (
SELECT m.id, t.team_long_name,
CASE WHEN m.home_goal > m.away_goal THEN 'MU Loss'
WHEN m.home_goal < m.away_goal THEN 'MU Win'
ELSE 'Tie' END AS outcome
FROM match AS m
LEFT JOIN team AS t ON m.awayteam_id = t.team_api_id)
-- Select team names, the date and goals
SELECT DISTINCT
m.date,
home.team_long_name AS home_team,
away.team_long_name AS away_team,
m.home_goal,
m.away_goal
-- Join the CTEs onto the match table
FROM match AS m
LEFT JOIN home ON m.id = home.id
LEFT JOIN away ON m.id = away.id
WHERE m.season = '2014/2015'
AND (home.team_long_name = 'Manchester United'
OR away.team_long_name = 'Manchester United');
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-- Set up the home team CTE
WITH home AS (
SELECT m.id, t.team_long_name,
CASE WHEN m.home_goal > m.away_goal THEN 'MU Win'
WHEN m.home_goal < m.away_goal THEN 'MU Loss'
ELSE 'Tie' END AS outcome
FROM match AS m
LEFT JOIN team AS t ON m.hometeam_id = t.team_api_id),
-- Set up the away team CTE
away AS (
SELECT m.id, t.team_long_name,
CASE WHEN m.home_goal > m.away_goal THEN 'MU Loss'
WHEN m.home_goal < m.away_goal THEN 'MU Win'
ELSE 'Tie' END AS outcome
FROM match AS m
LEFT JOIN team AS t ON m.awayteam_id = t.team_api_id)
-- Select columns and and rank the matches by goal difference
SELECT DISTINCT
m.date,
home.team_long_name AS home_team,
away.team_long_name AS away_team,
m.home_goal, m.away_goal,
RANK() OVER(ORDER BY ABS(home_goal - away_goal) DESC) as match_rank
-- Join the CTEs onto the match table
FROM match AS m
LEFT JOIN home ON m.id = home.id
LEFT JOIN away ON m.id = away.id
WHERE m.season = '2014/2015'
AND ((home.team_long_name = 'Manchester United' AND home.outcome = 'MU Loss')
OR (away.team_long_name = 'Manchester United' AND away.outcome = 'MU Loss'));
Run to view results