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所以,我有一个非常规的非常规问题。我希望能够将具有相同ID的行连接成一个大行。为了说明我的问题,让我举个例子。下面是该查询:PostgreSQL:如何连接行
SELECT b.id AS "ID",
m.content AS "Conversation"
FROM bookings b
INNER JOIN conversations c on b.id = c.conversable_id AND c.conversable_type = 'Booking'
INNER JOIN messages m on m.conversation_id = c.id
WHERE b.state IS NOT NULL
GROUP BY 1,2
LIMIT 1000;
这里是输出:
ID **Conversation
1223 "blah, blah, blah, blah"
1223 " ... blaaaah, blah.."
1223 "more blaaah"
1223 "last blah"
5000 "new id, with more blah"
5000 "and the blah continues"
有没有一种方法来连接会话行成一个总计行,同时保持ID?
像这样:
ID Conversation
1223 "blah, blah, blah, blah, ... blaaaah blah.. more blaaah, last blah"
5000 "new id, with more blah and the blah continues"
我相信有一个有效的方式来做到这一点。我无法自己想出来。
'group_concat()'是你的朋友。 – wildplasser
是不是MySQL? – DBE7
可能。也许'string_agg()',那么? – wildplasser