Aggregating Data
In this lesson you will learn how iFull definition for aggregation (opens in a new tab)Grouping rows and computing a value over each group. In Cypher the grouping keys are whatever expressions in the same clause are not aggregated. works in a iFull definition for Cypher (opens in a new tab)Neo4j's implementation of GQL, the ISO standard query language for graph databases. It is declarative: you describe the pattern to find, and the database decides how to find it. statement and how to work with iFull definition for property (opens in a new tab)A named value stored on a node or a relationship. that contain multiple values.
Cypher has a count() function that you can use to perform a count of iFull definition for node (opens in a new tab)A vertex in a graph. In a property graph it can carry labels and properties., iFull definition for relationship (opens in a new tab)A named, directed connection between two nodes. Every relationship has a type, a start node and an end node., paths, rows during query processing.
When you aggregate in a Cypher statement, this means that the query must process all iFull definition for pattern (opens in a new tab)A graph structure written in Cypher, such as a node joined to another node by a relationship. in the MATCH clause to
complete the aggregation to either return results or perform the next part of the query.
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