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Database schemas usage  RSS feed

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Hi all, I've a question about the database schemas, hope it's the right place.

What raised at his time the needs to have schemas for our databases? Basically, how can be defined a database schema and how we can make "speak" each other different schemas in our database?

"Bonus" question: In a microservices architecture application, should each microservice have his own schema and should communicate with other schemas without speaking to other microservices? What could be a good approach if from the microservice A I want to retrieve information from a schema referred by the microservice B (example, Address microservice speaking with the User microservice).

Thanks for your help and sorry for any mistake.
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