neo4j-cypher | A Ruby DSL for the Neo4j Cypher query language
kandi X-RAY | neo4j-cypher Summary
kandi X-RAY | neo4j-cypher Summary
A Ruby DSL for the Neo4j Cypher query language
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- Returns the expected message for this user
- Executes a query
- Returns true if this assertion is expected
neo4j-cypher Key Features
neo4j-cypher Examples and Code Snippets
Community Discussions
Trending Discussions on neo4j-cypher
QUESTION
I am trying to find a list of names that unique to one query and exclude the ones that are common between the results of two queries. For example, I want the name of the classes that have been taken by students A, B, and C. And exclude from this list the classes that were taken by students D and E. With the help of the answer to this question (Neo4j Cypher: exclude certain nodes from result), I tried this Cypher code and it works, but I get the results as nodes. I want it as a list of names, not nodes.
...ANSWER
Answered 2021-Jan-26 at 19:54You can have another WITH
and UNWIND
.
QUESTION
If I wanted to return a composite object, based on an exisiting node, I know that I could to this: (thanks to this post)
...ANSWER
Answered 2020-Feb-27 at 17:18MATCH(...)-[:HAS_DB]->(db: Database {name: "my_database")
WITH DISTINCT db
Return COLLECT( { name: db.name,
format: db.format,
}) AS database
QUESTION
I'm working on a rather big project. I need to use azure-security-keyvault-secrets, so I added following to my pom.xml file:
...ANSWER
Answered 2019-Dec-27 at 18:36So I managed to fix the problem with the maven-shade-plugin. I added following piece of code to my pom.xml file:
QUESTION
This is an extension of the following question:
I have a data lineage related graph in Neo4J with variable length path containing intermediate nodes (tables) as an array:
...ANSWER
Answered 2020-Jan-14 at 14:25did you try
QUESTION
First of all, I have looked at Can Neo4j Cypher query do similar thing as "Having" in SQL? and https://neo4j.com/developer/kb/how-do-i-achieve-the-equivalent-of-a-sql-having-clause-with-cypher/. They both have similar advice, but it doesn't seem to work in my case (perhaps because of the UNWIND clause I have?).
Here's my query:
...ANSWER
Answered 2019-Dec-20 at 22:03When you have an aggregate function in Cypher, think of anything not part of the aggregate as part of the group by in SQL. Instead of grouping by node t, it looks like you want to group by the value of property t.propTwo across multiple nodes.
Let's build some sample data.
QUESTION
15 to poi 4.0.0. Here are the poi dependencies I have on classpath.
poi-4.0.0 poi-scratchpad-4.0.0 poi-ooxml-4.0.0 poi-ooxml-schemas-4.0.0 xmlbeans-3.0.1
Getting below exception when I try to close workbook
...ANSWER
Answered 2018-Oct-09 at 17:25I am having the same issue. I noticed something in the change log that seems to indicate a breaking change in regards to the write() method and automatically closing the OutputStream. I am wondering if that is the issue.
QUESTION
I'm very beginner to Cypher query. So, I'm trying to understand MATCH and CREATE. Here's what I am currently defining relationship between author and the book:
...ANSWER
Answered 2019-Apr-07 at 17:05You can find the syntax error is WITH
required between CREATE
and MATCH
.
WITH
should be between CREATE
of the third line and MATCH
of the fifth(fourth?) line.
WITH is needed to chain, pipe the results from one query part to next. If this is confusing you, don't worry. You can read more here.
As you are not passing any results from the first part to second you don't need it, but it's syntactically incorrect.
You can add WITH in your query as shown below to remove the error.
QUESTION
I am trying to auto generate a a text file that can be run to create the nodes and relationships for a Neoj4 Graph.
The text file is being created in two sections:
First the nodes are created in a For loop (6000 nodes) with a result like this:
...ANSWER
Answered 2019-Jan-23 at 15:25You need to separate the statements with a semicolon, Please refer following queries:
QUESTION
I've migrated my relational database to neo4j and am studying whether I can implement some functionalities before I commit to the new system. I just read two neo4j books, but unfortunately they don't cover two key features I was hoping would be more self-evident. I'd be most grateful for some quick advice on whether these things will be easy to implement or whether I should stick to sql! Thx!
Features I need are: 1) I have run a script to assign :leaf label to all nodes that are leaves in my tree. In paths between a known node and its related leaf nodes, I aim to assign to every node a level property that reflects how many hops that node is from the known node (or leaf node - whatever I can get to work most easily).
I tried:
match path=(n:Leaf)-[:R*]->(:Parent {Parent_ID: $known_value})
with n, length(nodes(path)) as hops
set n.Level2=hops;
and
path=(n:Leaf)-[:R*]->(:Parent {Parent_ID: $known_value})
with n, path, length(nodes(path)) as hops
foreach (n IN relationships (path) |
set n.Level=hops);
The first assigns property with value of full length of path to only leaf nodes. The second assigns property with value of full length of path to all relationships in path.
Should I be using shortestpath instead, create a bogus property with value =1 for all nodes and iteratively add weight of that property?
2) I need to find the common children for a given parent node. For example, my children each [:like] lots of movies, and I would like to create [:like] relationships from myself to just the movies that my children all like in common (so if 1 of 1 likes a movie, then I like it too, but if only 2 of 3 like a movie, nothing happens).
I found a solution with three paths here: Need only common nodes across multiple paths - Neo4j Cypher But I need a solution that works for any number of paths (starting from 1).
3) Then I plan to start at my furthest leaf nodes, create relationships to children's movies, and move level by level toward my known node and repeat create relationships, so that the top-most grandparent likes only the movies that all children [of all children of all children...] like in common and if there's one that everybody agrees on, that's the movie the entire extended family will watch Saturday night.
Can this be done with neo4j and how hard a task is it for someone with rudimentary Cypher? This is mostly how I did it in my relational database / Should I be looking at implementing this totally differently in graph database?
Most grateful for any advice. Thanks!
...ANSWER
Answered 2018-Dec-10 at 10:121.
shortestPath() may help when your already matched start and end nodes are not the root and the leaf, in that it won't continue to look for additional paths once the first is found. If your already matched start and end nodes are the root and the leaf when the graph is a tree structure (acyclic), there's no real reason to use shortestPath().
Typically when setting something like the depth of a node in a tree, you would use length(path)
, so the root would be at depth 0, its children at depth 1.
Usually depth is calculated with respect to the root node and not leaf nodes (as an intermediate node may be the ancestor of multiple leaf nodes at differing distances). Taking the depth as the distance from the root makes the depths consistent.
Your approach with setting the property on relationships will be a problem, as the same relationship can be present in multiple paths for multiple leaf nodes at varying depths. Your query could overwrite the property on the same relationship over and over until the last write wins. It would be better to match down to all nodes (leave out :Leaf
in the query), take the last relationship in the path, and set its depth:
QUESTION
I want to delete the the special "root" node in my Neo4j Database.
I already found some Question/Answer in SO, but they are not useful, from different reason.
We uses a db:DATABASE node for store the tenant data in Neo4j, and all other node is somehow connected to this node. So the real Neo4j Root Node just have connections to this DATABASE-s. It means whet a new node is created under the tenant, this new node intermediately has a connection to DATABASE node, and the connection name is CONTAINS.
here is the creation code of the DATABASE node
...ANSWER
Answered 2018-Dec-09 at 13:13Okay, this should be a simple one.
Provided that the :Database node for the tenant and all reachable nodes from it are to be deleted, without regard for node label or relationship type connecting them, the fastest approach will be to use path expander procs from APOC Procedures to match to all nodes in the subgraph and delete them:
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On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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