some useful cypher statements

[jihot2000]

Is your feature request related to a problem? Please describe. I find it is difficult when I try to query a link list. I searched and found some useful cypher statements which works for Neo4j.

Describe the solution you'd like

• UNWIND a vertex list

MATCH p=()-[]->()
WITH nodes(p) AS a
UNWIND a AS b
RETURN b

• WHERE not a relationship

MATCH (head)-[:edge*]->()
WHERE NOT ()-[:edge]->(head)
RETURN head

• list generation using IN

MATCH p=()-[]->()
WITH nodes(p) AS a
RETURN [x IN a | x.name]

[jihot2000]

I find 'WHERE NOT EXISTS' can do path pattern not match

MATCH (head)-[:edge*]->()
WHERE NOT EXISTS (()-[:edge]->(head))
RETURN head

[jrgemignani]

List comprehension will be upcoming. Unwind should work, we will be looking into that.