信息
有没有办法可以在一个LEFT JOIN中两次从另一个(同一个)表中检索两位信息?
尝试
下面是我试图放在一起的SQL查询,希望能有效。我希望你能看到我想从中做些什么。
SELECT cards.*, list.name FROM cards
LEFT JOIN list ON cards.main = list.id AS main_name
AND cards.enemy = list.id AS enemy_name
WHERE cards.id = 1
如上所示,我正在尝试从cards.main
表中检索两个值cards.enemy
和list
的名称。
谢谢,任何问题都会尽快回答!
答案 0 :(得分:0)
您必须两次加入列表表:
SELECT cards.*, main_name.name, enemy_name.name
FROM cards
LEFT JOIN list AS main_name ON cards.main = main_name.id
LEFT JOIN list AS enemy_name ON cards.enemy = enemy_name.id
WHERE cards.id = 1