6_join.sql

-- Modify it to show the matchid and player name for all goals scored by Germany. To identify German players, check for: teamid = 'GER'
SELECT matchid, player
FROM goal
WHERE teamid = 'GER';

-- Show id, stadium, team1, team2 for just game 1012
SELECT id, stadium, team1, team2
FROM game
WHERE id = 1012;

-- Modify it to show the player, teamid, stadium and mdate for every German goal.
SELECT player,teamid,stadium,mdate
 FROM game JOIN goal ON (game.id=goal.matchid)
WHERE goal.teamid = 'GER';

-- Show the team1, team2 and player for every goal scored by a player called Mario player LIKE 'Mario%'
SELECT game.team1, game.team2, player
 FROM game JOIN goal ON (game.id=goal.matchid)
WHERE goal.player LIKE 'Mario%';

-- Show player, teamid, coach, gtime for all goals scored in the first 10 minutes gtime<=10
SELECT player, teamid, coach, gtime
 FROM eteam JOIN goal ON (eteam.id=goal.teamid)
WHERE goal.gtime<=10;

-- List the dates of the matches and the name of the team in which 'Fernando Santos' was the team1 coach.
SELECT game.mdate, eteam.teamname
FROM game
INNER JOIN eteam
ON eteam.id = game.team1
WHERE eteam.coach = 'Fernando Santos';

-- List the player for every goal scored in a game where the stadium was 'National Stadium, Warsaw'
SELECT goal.player
FROM game
INNER JOIN goal
ON goal.matchid = game.id
WHERE game.stadium = 'National Stadium, Warsaw';

-- Instead show the name of all players who scored a goal against Germany.
SELECT DISTINCT goal.player
FROM game
INNER JOIN goal
ON goal.matchid = game.id
WHERE (game.team1 = 'GER' OR game.team2 = 'GER')
AND goal.teamid != 'GER';

-- Show teamname and the total number of goals scored.
SELECT teamname, COUNT(goal.player)
  FROM eteam JOIN goal ON id=teamid
GROUP BY eteam.teamname;

-- Show the stadium and the number of goals scored in each stadium.
 SELECT stadium, COUNT(goal.player)
  FROM game JOIN goal ON id=matchid
GROUP BY game.stadium;

-- For every match involving 'POL', show the matchid, date and the number of goals scored.
SELECT goal.matchid,game.mdate,COUNT(goal.player)
  FROM game JOIN goal ON goal.matchid = game.id
WHERE game.team1='POL' OR game.team2='POL'
GROUP BY goal.matchid,game.mdate;

-- For every match where 'GER' scored, show matchid, match date and the number of goals scored by 'GER'
SELECT goal.matchid,game.mdate,COUNT(goal.teamid)
  FROM game JOIN goal ON goal.matchid = game.id AND goal.teamid='GER'
WHERE game.team1='GER' OR game.team2='GER'
GROUP BY goal.matchid,game.mdate;

-- List every match with the goals scored by each team as shown. This will use "CASE WHEN" which has not been explained in any previous exercises.
SELECT game.mdate,game.team1,
SUM(CASE WHEN goal.teamid = game.team1 THEN 1
ELSE 0 END) AS score1,
game.team2, SUM(CASE WHEN goal.teamid = game.team2
THEN 1 ELSE 0 END) AS score2
FROM game
LEFT JOIN goal
ON goal.matchid = game.id
GROUP BY mdate, matchid, team1, team2;