Why do NoSQL databases not support joins?

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  • ArangoDB

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    (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/

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