OrientDB SQL：检索具有非零度数的顶点

Question

I would like to retrieve all vertices in a SQL query that have at least one connection (non-zero degree). Just returning the rid is probably OK, but it would be nice to select properties too.

The edges have "in" and "out" properties, so I could make a set of those. I'm not sure how to do this with OrientDB sql.

Also, I thought there would be some way to do it more naturally by querying vertices directly. I see the vertices have IN and OUT recorded, and the edge Class name underneath. But I do not know how to access the vertex IN and OUT in a SQL query.

Answer 1

The following query should do the trick

SELECT FROM V WHERE both().size() > 0

If you need additional properties or additional filters, you can just add them to the query, eg.

SELECT property1, property2 FROM V WHERE both().size() > 0 and foo = 'bar'

Answer 2

IN and OUT are accessed with in() and out() . These can go right after SELECT to retrieve them, or, in the predicate as where Luigi has used both() (short for in() and out() ).

The complete list of "graphy" functions is in the docs, here , in the first column.