neo4j 随机节点输出

Question

我有一个活动节点与图片节点有关系。

我试图在查询找到的每个广告系列中获取与其关联的随机图片。

我成功地为单个活动获取了一张随机图片，但如果我想为每个活动输出一张关联的图片，我就很难做到。

这是在活动中获取单张照片的示例。

MATCH (campaign:Campaign)-[]-(picture:Picture) where  
campaign.id="1429184083571" or campaign.id='1429182615443'
WITH picture, rand() AS r,campaign
ORDER BY r
RETURN campaign,picture
limit 1

我怎样才能为每个活动输出一张连接的随机图片？

Answer 1

这应该有效：

MATCH (campaign:Campaign)-[]-(picture:Picture)
with campaign, collect(picture) as pictures
RETURN campaign,pictures[toInt(rand()*size(pictures))]

neo4j 随机节点输出

neo4j random nodes output

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