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Question

我有一张表Identity(id, super_identity_id)和一张表Conversation(id, identity_id)

多个身份可以引用相同的super_identity。

说我有identity A，我想得到所有conversations

1. 谁属于A
2. 和谁属于super_identity
的A
3. 和谁属于identity与super_identity
相同的A人

我能做的最好的事情是

select 
    i.id,
    i.super_identity_id
from identities i 
left join identities ii on ii.super_identity_id = i.super_identity_id
where ii.id = 133

但上述内容并不尊重(2)

有什么想法吗？

Answer 1

select 
i.id,
i.super_identity_id
from identities i 
inner join identities ii on ii.super_identity_id = i.super_identity_id and ii.id = 133