How to use JOIN with Conditions - mysql

Question

In MySQL on the command-line, I am trying to print the names of teams that have scored more than 3 goals in a single game, whether it was the home team, the away team, or both.
I have two relations:
Team
+---------+-----------+------+----+
| name | shortName | abbr | id |
+---------+-----------+------+----+
Game
+---------+--------------+--------------+------------+------------+
| game_id | home_team_id | away_team_id | score_home | score_away |
+---------+--------------+--------------+------------+------------+
(home_team_id and away_team_id are both foreign keys for Team.id)
I started by trying to find the game_ids where a team had scored more than 3 goals:
> SELECT game_id, score_home, score_away
FROM Game
WHERE score_home > 3 OR score_away > 3;
+---------+------------+------------+
| game_id | score_home | score_away |
+---------+------------+------------+
| 7 | 6 | 2 |
| 35 | 3 | 4 |
| 70 | 4 | 1 |
| 71 | 2 | 5 |
| 84 | 5 | 1 |
| 88 | 6 | 2 |
| 97 | 1 | 5 |
| 103 | 6 | 1 |
+---------+------------+------------+
So I'm pretty sure there should only be about 8 teams at most that have scored more than 3 goals. I then tried INNER JOINS but I'm not quite sure how this works with two different foreign keys and conditions but this was my attempt:
> SELECT Team.name as Team_Name, Game.game_id, Game.score_home, Game.score_away
-> FROM Team
-> INNER JOIN Game ON Team.id=home_team_id OR Team.id=away_team_id
-> WHERE score_home > 3 OR score_away > 3;
+-------------------+---------+------------+------------+
| Team_Name | game_id | score_home | score_away |
+-------------------+---------+------------+------------+
| Arsenal | 71 | 2 | 5 |
| Everton | 7 | 6 | 2 |
| Manchester City | 70 | 4 | 1 |
| Manchester City | 84 | 5 | 1 |
| Manchester City | 103 | 6 | 1 |
| Norwich City | 88 | 6 | 2 |
| Tottenham Hotspur | 70 | 4 | 1 |
| Tottenham Hotspur | 97 | 1 | 5 |
| Newcastle United | 88 | 6 | 2 |
| Newcastle United | 103 | 6 | 1 |
| West Ham United | 35 | 3 | 4 |
| Leicester City | 71 | 2 | 5 |
| Sunderland | 7 | 6 | 2 |
| Bournemouth | 35 | 3 | 4 |
| Bournemouth | 84 | 5 | 1 |
| Bournemouth | 97 | 1 | 5 |
+-------------------+---------+------------+------------+
It's giving me both the home team name and the away team when I only want the team that scored higher than 3 points. Please help.

Answer 1

Get all the team IDs in one column in a subquery using UNION and then join the teams to it.
SELECT t.name
FROM (SELECT g.home_team_id team_id
FROM game g
WHERE score_home > 3
UNION
SELECT g.away_team_id team_id
FROM game g
WHERE score_away > 3) x
INNER JOIN team t
ON t.id = x.team_id;

Answer 2

One approach uses correlated subqueries:
select t.name
from team t
where exists (select 1
from game g
where g.home_team_id = t.id and
g.score_home > 3
) and
exists (select 1
from game g
where g.away_team_id = t.id and
g.score_away > 3
) ;
This query can take advantage of indexes on game(home_team_id, score_home) and game(away_team_id, score_away).

Answer 3

This following query will return Home and Away in separate row if both scored more than 3 goals in a single match-
SELECT
T.Name as [Team_Name],
A.Team_Type,
A.Game_id,
A.Score
FROM
(
SELECT 'Home' AS [Team_Type],game_id AS Game_id,home_team_id as team_ID, score_home as Score WHERE score_home>3
UNION ALL
SELECT 'Away' AS [Team_Type], game_id AS Game_id,away_team_id as team_ID, score_away as Score WHERE score_away>3
)A
INNER JOIN Team T
ON T.id = A.team_ID
ORDER BY A.Game_id