It is important to understand the difference between Relational and Non-relational storage solution because different solution fits for different use cases and application type.
I have organized some resources below for you to understand the different between these 2 and hopefully after reading these you can:
•Know the different datastore categories available
•Know the different use cases for data store workloads
•Know the Azure and OSS datastore offerings available
•Design solutions that pick the right datastores for the use case
Choosing the Right Datastore
https://docs.microsoft.com/en-us/azure/architecture/guide/technology-choices/data-store-overview
Criteria for choosing a data store
https://docs.microsoft.com/en-us/azure/architecture/guide/technology-choices/data-store-comparison
Choosing a big data storage technology in Azure
https://docs.microsoft.com/en-us/azure/architecture/data-guide/technology-choices/data-storage
Choosing a search data store in Azure
https://docs.microsoft.com/en-us/azure/architecture/data-guide/technology-choices/search-options
Choosing a stream processing technology in Azure
https://docs.microsoft.com/en-us/azure/architecture/data-guide/technology-choices/stream-processing
Choosing a batch processing technology in Azure
https://docs.microsoft.com/en-us/azure/architecture/data-guide/technology-choices/batch-processing
Choosing a real-time message ingestion technology in Azure
Thank you,
Your friend,
Annie
Annie Xu 
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