Why do NoSQL databases not support joins?

This page summarizes the projects mentioned and recommended in the original post on news.ycombinator.com
NoSQL multi-model graph-database document-database Key-Value

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  • ArangoDB

    🥑 ArangoDB is a native multi-model database with flexible data models for documents, graphs, and key-values. Build high performance applications using a convenient SQL-like query language or JavaScript extensions.

    • (1) Joins are a challenge to implement, particularly if CPU, network, and storage use matter. To get excellent results the database needs a query optimizer that can make a good guess of what query plan will be effective.

    (2) There are many databases with other query languages that support joins, just a few are

    https://www.arangodb.com/

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

    InfluxDB logo
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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