TW Neo4j

A Node is the 'Table' of the Graph Database world.   The main entity in a graph. They are also sometimes referred to as vertices or points. In our ASCII art world, a pair of parentheses is used to represent nodes. This resembles a circle and provides a simplified syntax for representing a node in ASCII:     ()     (node) The variable (node) holds node values so they can be processed or returned in a query later on. If you do not need to do anything with the node, you can skip the use of the variable. 

Delete nodes without labels MATCH (n) WHERE size(labels(n)) = 0 DETACH DELETE n Similarly you can find nodes without labels using: MATCH (n) WHERE size(labels(n)) = 0 RETURN n

Determining Node labels From a post on the Neo4j blog we have a path to finding our generic node name (x) How do I display all nodes with no defined labels Although assigning a node one or more labels provides many benefits (i.e. performance gains from index usage, ability to group nodes into sets, etc), it is possible to create a node without any labels. The following Cypher can be used to identify all nodes in the graph which have no label defined: MATCH (n) WHERE SIZE(labels(n)) = 0 RETURN n It points the way for us to do some generic style Cypher (and solve for (x) ). What is node label (x)? Assuming we have a network of nodes (c) and we are tasked with applying common metadata against these nodes with fixed values and groupings it makes sense to utilise the strengths of the graph engine to 'TAG' the nodes in the network represented by (c). If we create several 'tag' nodes and our sample node (c); for example: CREATE (x:UPWARD  {name:'upward'} ) CREATE (x:DO...

Labels are the 'TABLES' of the Graph database world. Here's some useful methods of manipulating Labels. Rather than delete and create your Nodes in Neo4j just to change the label, it may be easier to try one of the two methods below: Rename node - Method 1: MATCH (s:OldLabel) SET s:NewLabel REMOVE s:OldLabel Rename node - Method 2: MATCH (n:OldLabel) WITH COLLECT(n) AS nodes CALL apoc.refactor.rename.label('OldLabel','NewLabel'[,nodes]) YIELD errorMessages AS eMessages RETURN eMessages; Do you have any more ways of 'renaming' Nodes in Neo4j? Nodes can also have more than one Label. Here is how to add and remove a Label on a Node where the only matching property is {name : 'Greg'} How to add a new label MATCH (n { name: 'Greg' }) SET n:NewLabel RETURN n.name, labels(n) AS labels How to remove a label MATCH (n { name: 'Greg' }) REMOVE n:OldLabel RETURN n.name, labels(n) AS labels