如何编写子查询? [英] How do I write a sub-query?

问题描述

我想检索所有顶点，并希望为每个顶点计算指向它的赞"边数.

I want to retrieve all vertexes and for each one I want to count the number of 'Like' edges pointing at it.

如何在Gremlin中编写这种查询?

How do I write this kind of query in Gremlin?

在SQL中可能类似于......

In SQL it could be something like....

SELECT *, (SELECT Count(*) FROM tbl_like l WHERE l.id = b.id) AS LikeCount
FROM tbl_blah b

推荐答案

不需要副作用...

g.V().transform{[it, it.in('likes').count()]}

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