Php Mysql 总和超过 2 列和 select 来自 2 个表

Question

I have a MySQL database with 3 tables.

• Table player

P_id = content (1, 2, 3,)

P_name = content (Spieler1name, Spieler2name, Spieler3name)

• Table tournament

T_id = content (1, 2)

T_date = content (2018, 2019)

T_players = content (123, 123)

• Table Games

G_id = content (1, 2)

G_tournament_id = content (T_id from table tournament)

G_player_away = Content (as an example user id 1)

G_player_home = content (as an example user id 2)

G_player_away_points = Content (11)

G_player_home_points = Content (8)

The Games table has even more data.

Now I want to create a table with PhP as ranking.

Place name points

1. Spieler1name 11

2. Spieler2name 8

3. Spieler3name 4

4. ....

Can someone tell me how the php query from the mysql database works? I tested this but it doesn't work.

SELECT SUM(G_player_away_points) AS total FROM Games 
UNION
SELECT SUM(G_player_home_points) AS total FROM Games
GROUP BY G_player_away

In the code above, he also sums the points from the opponent. This is of course not correct, it should only the points obtained by him appear in the output with php table. Furthermore you have to get the name from the table players. Can someone help me?

Answer 1

If you are using single table and multiple column for sum then you should try with this

SELECT SUM(G_player_away_points + G_player_home_points) AS total FROM Games 
GROUP BY G_player_away