Neo4j: Get all nodes in a graph, even those that are unconnected by relationships

So, this gives you all nodes:

MATCH (n)
RETURN n;

If you want to delete everything from a graph, you can do something like this:

MATCH (n)
OPTIONAL MATCH (n)-[r]-() 
DELETE n, r;

Updated for 2.0+

Edit: Now in 2.3 they have DETACH DELETE, so you can do something like:

MATCH (n)
DETACH DELETE n;

Would this work for you?

START a=node:index_name('*:*')

Assuming you have an index with these orphaned nodes in them.

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