[英]How to sort a JOIN query between 2 tables with the corresponding SUM of a column in a 3rd table?
[英]How to join 2 tables with a common column in another 3rd table?
我想将餐桌视频与餐桌人一起加入,但是他们之间没有直接的共同栏目,但两个餐桌都与餐桌村拥有共同的栏目,所以帮我来一起把餐桌人与餐桌视频一起来 。
id village_id
1 smg
id village_id
1 smg
id name
smg hdd
我已经尝试了以下代码,但无法正常工作:
SELECT people.id, video.id
FROM people
JOIN village ON people.village_id = village.id
JOIN video ON video.village_id = village.id
如果您提供的表格结构正确,那么您确实可以在视频和人物之间建立链接。 你有village_id ...
SELECT p.id , vid.id
FROM people as p
INNER JOIN video as vid
ON vid.village_id = p.village_id
如果您不希望有任何重复的值,则可以像这样执行SELECT DISTINCT
SELECT DISTINCT p.id , vid.id
FROM people as p
INNER JOIN video as vid
ON vid.village_id = p.village_id
您能否提供您想要的更多详细信息?
SELECT * FROM
(SELECT people.village_id AS pv_id, village.id AS v_id FROM
people JOIN village ON people.village_id = village.id) AS T
JOIN video ON video.village_id = T.v_id;
我假设您要进行三重联接。 我首先将人和村庄合并为一个表,并将其命名为T,然后将T与视频表合并。
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