Learning Neo4j 3.x - Second Edition

Update data

The logic is that to update one or more nodes, you need to MATCH them. Then, you set the new values of the properties that you want to update. Let's say that a year has passed. We need to update the ages of the Person nodes:

MATCH (n:Person{name:"Juliet"})WHERE n.age = 13SET n.age=14RETURN n ;

In a yearly batch, we can use the following query to update all the Person nodes:

MATCH (n:Person)SET n.age=n.age+1RETURN n ;

You will notice how fast it is on our little dataset. It did not take ages.

Note that it is possible to add labels dynamically, and also to remove them.

Add the Teen label to that Person nodes with an age greater than 12 and lower than 18:

MATCH (n:Person)WHERE n.age>=12 AND n.age <18SET n:TeenRETURN n ;

You can remove ...