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Learning Neo4j 3.x - Second Edition by Rik Van Bruggen, Jérôme Baton

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Complex queries

Complex queries are the types of questions that you want to ask of your data that are inherently composed of a number of complex join-style operations. These operations, as every database administrator knows, are very expensive operations in relational database systems, because we need to be computing the Cartesian product of the indices of the tables that we are trying to join. That may be okay for one or two joins between two or three tables in a relational database management system, but as you can easily understand, this problem becomes exponentially bigger with every table join that you add. On smaller datasets, it can become an unsolvable problem in a relational system, and this is why complex queries become problematic. ...

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