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Graph Data Processing with Cypher

Graph Data Processing with Cypher

By : Ravindranatha Anthapu
4.7 (10)
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Graph Data Processing with Cypher

Graph Data Processing with Cypher

4.7 (10)
By: Ravindranatha Anthapu

Overview of this book

While it is easy to learn and understand the Cypher declarative language for querying graph databases, it can be very difficult to master it. As graph databases are becoming more mainstream, there is a dearth of content and guidance for developers to leverage database capabilities fully. This book fills the information gap by describing graph traversal patterns in a simple and readable way. This book provides a guided tour of Cypher from understanding the syntax, building a graph data model, and loading the data into graphs to building queries and profiling the queries for best performance. It introduces APOC utilities that can augment Cypher queries to build complex queries. You’ll also be introduced to visualization tools such as Bloom to get the most out of the graph when presenting the results to the end users. After having worked through this book, you’ll have become a seasoned Cypher query developer with a good understanding of the query language and how to use it for the best performance.
Table of Contents (18 chapters)
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1
Part 1: Cypher Introduction
4
Part 2: Working with Cypher
9
Part 3: Advanced Cypher Concepts

Working with aggregations

In Cypher, aggregations are supported using the COUNT, SUM, AVG, MIN, MAX, COLLECT, PERCENTILE, and STDEV functions. Except for the COLLECT function, all the other functions are standard mathematical functions. COLLECT functions create a list of entities similar to data pivoting by converting a list of rows into a column value.

We have seen the usage of the COUNT function numerous times in this chapter. We can combine COUNT and COLLECT to count the entities as well as collect the values as a list. Let us take a look at the drug prescription query where we were returning patient counts. We will also return the first names of those patients along with the count.

For this, the Cypher query looks like this:

MATCH (d:Drug)<-[:HAS_DRUG]-()<-[:HAS_ENCOUNTER]-(p)
WITH DISTINCT d, p
WITH d.description as drug,
     COUNT(p) as patients,
     COLLECT(p.firstName) as firstNames
WHERE patients > 10
RETURN...

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