从具有不同标准的一列获取2个值？

Question

我有2张牌桌，球员和禁令。

players = id, name

bans = id, type, banned_id, accuser_id

如何在一行中同时选择被禁止和指责的玩家姓名？这是我的错误代码：

SELECT `bans`.`id`, `players`.`name` AS `banned`, `players`.`name` AS `accuser`
FROM `bans`, `players`
WHERE `bans`.`type` = 2;

Answer 1

如果您只想获取有关被禁用户的数据

SELECT b.id, p.name as accuser FROM bans b JOIN players p  ON p.id=b.accuser_id WHERE b.type=2

如果您想获取有关禁令信息的所有用户的数据

SELECT * FROM players p LEFT JOIN bans b ON b.accuser_id = p.id