Neo4j

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<li>Neo4j is a&nbsp;<strong>Database</strong>&nbsp;&ndash; use it to reliably&nbsp;<strong>store information</strong> and&nbsp;<strong>find it later</strong></li>

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<li>Neo4j&rsquo;s data model is a&nbsp;<strong>Graph</strong>, in particular a&nbsp;<strong>Property Graph</strong></li>

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<li><strong>Cypher</strong> is Neo4j&rsquo;s graph query language (<strong>SQL for graphs!</strong>)</li>

<li>Cypher is a declarative query language: it describes&nbsp;<strong>what</strong> you are interested in, not&nbsp;<strong>how</strong> it is acquired.</li>

<li>Cypher is meant to be very&nbsp;<strong>readable</strong> and&nbsp;<strong>expressive</strong></li>

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<h2 id="basics" class="section_title" data-magellan-target="basics">Neo4j Basics</h2>

<h3>The Labeled Property Graph Model</h3>

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<h3 class="default">Nodes</h3>

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<li>Nodes are the main data elements</li>

<li>Nodes are connected to other nodes via <strong>relationships</strong></li>

<li>Nodes can have one or more <strong>properties</strong> (i.e., attributes stored as key/value pairs)</li>

<li>Nodes have one or more <strong>labels</strong> that describes its role in the graph</li>

<li>Example: Person nodes vs Car nodes</li>

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<h3 class="default">Relationships</h3>

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<li>Relationships connect two nodes</li>

<li>Relationships are directional</li>

<li><strong>Nodes</strong> can have multiple, even recursive relationships</li>

<li>Relationships can have one or more <strong>properties</strong> (i.e., attributes stored as key/value pairs)</li>

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<h3 class="default">Properties</h3>

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<li>Properties are named values where the name (or key) is a string</li>

<li>Properties can be indexed and constrained</li>

<li>Composite indexes can be created from multiple properties</li>

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<h3 class="default">Labels</h3>

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<li>Labels are used to group <strong>nodes</strong> into sets</li>

<li>A node may have multiple labels</li>

<li>Labels are indexed to accelerate finding nodes in the graph</li>

<li>Native label indexes are optimized for speed</li>

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