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Mongo is the main nosql choice. Mongo is great if you think a flexible schema is good. Mongo is not great if you think a flexible schema is bad. That sums it up

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This is too reductive, you can essentially have flexible schemas with most modern relational databases and without the downsides of document-based DBs.

In 99% of the cases, even if you need a flexible schema, PostgreSQL will remain the best choice.

Unless it's not.

it probably is though

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