MYSQL Select 多个条目

Question

Table: chats [ ChatID |   Name   ]
             [    1   | TestChat ]

Table: chat_members [ ChatID | CharacterID ]
                    [    1   |     1755    ]
                    [    1   |       6     ]

---

SELECT * FROM chats INNER JOIN chat_members ON (chats.ChatID = chat_members.ChatID) WHERE chat_members.CharacterID = 1755

[{"ChatID":1,"Name":"TestChat","ChatID1":1,"CharacterID":1755}]

如何获得以下回调？

[{"ChatID":1,"Name":"TestChat","ChatID1":1,"CharacterID":1755,"ChatID2":1,"CharacterID1":6}]

我想从 CharacterID 中获取桌面聊天中的聊天以及 chats_members 中的所有条目......有什么想法吗？

Answer 1

SELECT c1.*, m2.*
-- use 1st copy of members list
FROM chat_members m1
-- find the chat where the member in interest is participated
JOIN chats c1 ON m1.ChatID = c1.ChatID AND m1.CharacterID = 1755
-- use 2nd copy of members list, find all memebers participated in the chat found
JOIN chat_members m2 ON m2.ChatID = c1.ChatID

或（这种形式对一半的人来说更清楚，除了查询文本没有什么不同）

SELECT c1.*, m2.*
FROM chats c1
-- use 1st copy of members list
-- and find the chat where the member in interest is participated
JOIN chat_members m1 ON m1.ChatID = c1.ChatID AND m1.CharacterID = 1755
-- use 2nd copy of members list, find all memebers participated in the chat found
JOIN chat_members m2 ON m2.ChatID = c1.ChatID