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Neo4j Cypher Documentation

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docs-cypher's Introduction

Neo4j: Graphs for Everyone

Neo4j is the world’s leading Graph Database. It is a high performance graph store with all the features expected of a mature and robust database, like a friendly query language and ACID transactions. The programmer works with a flexible network structure of nodes and relationships rather than static tables — yet enjoys all the benefits of enterprise-quality database. For many applications, Neo4j offers orders of magnitude performance benefits compared to relational DBs.

Learn more on the Neo4j website.

Using Neo4j

Neo4j is available both as a standalone server, or an embeddable component. You can download or try online.

Extending Neo4j

We encourage experimentation with Neo4j. You can build extensions to Neo4j, develop library or drivers atop the product, or make contributions directly to the product core. You’ll need to sign a Contributor License Agreement in order for us to accept your patches.

Dependencies

Neo4j is built using Apache Maven version 3.8.2 and a recent version of supported VM. Bash and Make are also required. Note that maven needs more memory than the standard configuration, this can be achieved with export MAVEN_OPTS="-Xmx2048m".

macOS users need to have Homebrew installed.

With brew on macOS

brew install maven

Please note that we do not support building Debian packages on macOS.

With apt-get on Ubuntu

sudo apt install maven openjdk-17-jdk

Be sure that the JAVA_HOME environment variable points to /usr/lib/jvm/java-17-openjdk-amd64 (you may have various java versions installed).

Building Neo4j

Before you start running the unit and integration tests in the Neo4j Maven project on a Linux-like system, you should ensure your limit on open files is set to a reasonable value. You can test it with ulimit -n. We recommend you have a limit of at least 40K.

A plain mvn clean install -T1C will only build the individual jar files.
Test execution is, of course, part of the build.
In case you just want the jars, without running tests, this is for you: mvn clean install -DskipTests -T1C.
You may need to increase the memory available to Maven: export MAVEN_OPTS="-Xmx2048m" (try this first if you get build errors).

Running Neo4j

After running a mvn clean install, cd into packaging/standalone/target and extract the version you want, then:

bin/neo4j-admin server start

in the extracted folder to start Neo4j on localhost:7474. On Windows you want to run:

bin\neo4j-admin server start

instead.

Neo4j Desktop

Neo4j Desktop is a convenient way for developers to work with local Neo4j databases.

To install Neo4j Desktop, go to Neo4j Download Center and follow the instructions.

Licensing

Neo4j Community Edition is an open source product licensed under GPLv3.

Neo4j Enterprise Edition includes additional closed-source components not available in this repository and requires a commercial license from Neo4j or one of its affiliates.

Trademark

Neo4j’s trademark policy is available at our trademark policy page.

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docs-cypher's Issues

"shadowning of variable not allowed", a doc bug?

I would perceive from context of this doc, that "variable shadowing" may happen, but could be undesirable when not intended. Is the "not allowed" phrasing a doc bug here?

https://github.com/neo4j/docs-cypher/blob/727287b89881ba1ab1697a619c079527209e912a/modules/ROOT/pages/syntax/expressions.adoc?plain=1#LL553C1-L553C61

Neo.ClientError.Statement.SyntaxError

When I execute this statement：
MATCH (tom:Person {name:'Tom Hanks'})--{2}(colleagues:Person) RETURN DISTINCT colleagues.name AS name, colleagues.born AS bornIn ORDER BY bornIn LIMIT 5

the result:
Neo.ClientError.Statement.SyntaxError:Quantified path patterns are not yet supported. (line 1, column 38 (offset: 37)) "MATCH (tom:Person {name:'Tom Hanks'})--{2}(colleagues:Person)"

why ?
Document address

Neo4j Browser version: 5.11.0
Neo4j Server version: 5.3.0(enterprise)

bug/snack-bar-covers-sidenav-text

Snackbar with label "Was this page helpful?" blocks bottom part of right sidenav text in aggregating functions page and does not close on page refresh or submission of response data.

aggregation § on subquery page

hi,

On the subqueries page, the example given for § aggregation https://neo4j.com/docs/cypher-manual/current/subqueries/call-subquery/
#call-aggregation

returns the same with or without a subquery

Which seem contradictory with the first sentence "Returning subqueries change the number of results of the query."

as a result, I can not figure what this § is about ...

25 -> 35 in svg image

in https://github.com/neo4j/docs-cypher/blob/5.x/modules/ROOT/pages/subqueries/collect.adoc
the svg image of the data displays age :25 for Pete when CREATE data query and displayed results use 35

Update duration.doc

Version: 5.5.0 instance on GraphAcademy

Hey,
I'm learning neo4j through graph academy and was learning about duration. In docs I found this section about inDays. The code however returns Duration in other format than specified. To get the duration in days, I had to additionally call .days. This is also what the transcript says in the GraphAcademy section about working with dates

Steps to reproduce:

Copy the code from documentation and execute it
You should receive Duration in other formats than days - see screenshot

I encounter the same issue for toSeconds and toMonths

Possible solution:
Call days/seconds/months in the code snippet and update return values.