[英]SQL same join in two columns with different values
我不知道什么是最好的方法
斗爭
Fighter_ID1 | Fighter_ID2
FIGHTERS
ID | Fighter
OUTPUT
Fighter1 | Fighter2
我想將表FIGHTERS
的列fighter
與表FIGHT
..中的兩列合並。
這可能是一個愚蠢的問題,但我不知道如何正確地做到這一點
對不起我的英語,謝謝
SELECT F1.Fighter as Fighter1,
F2.Fighter as Fighter2
FROM FIGHT
INNER JOIN FIGHTERS as F1 ON FIGHT.Fighter_ID1 = F1.ID
INNER JOIN FIGTHERS as F2 ON FIGHT.Fighter_ID2 = F2.ID
看來您需要兩次參加桌子。
SELECT fs1.Fighter as Fighter1, fs2.Fighter as Figther2
FROM Fight f
INNER JOIN Fighters fs1
ON f.Fighter_ID1 = fs1.id
INNER JOIN Fighters fs2
ON f.Fighter_ID2 = fs2.id
怎么樣
select f1.name, f2.name -- pick any column you like
from FIGHT f -- from here we join both fighters by id
join FIGHTER f1 on f.fighter_id1 = f1.id
join FIGHTER f2 on f.fighter_id2 = f2.id
因為每次戰斗您都會有2名戰士,所以您需要為表格起別名。 我直接在此處輸入此內容,因此我不能保證它是100%准確的,但它看起來應該像這樣:
SELECT *
FROM FIGHT
INNER JOIN FIGHTERS AS F1 ON F1.ID = Fighter_ID1
INNER JOIN FIGHTERS AS F2 ON F2.ID = Fighter_ID2
然后,您可以使用F1.Fighter和F2.Fighter作為字段獲取戰斗機名稱。
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