According to this: http://code.google.com/appengine/docs/whatisgoogleappengine.html it seems that GAE only uses Datastore to store data, which is equivalent with Table service on Windows Azure Platform.
Does anyone know that which RDBMS it uses? or such thing exists or not?
EDIT: Windows Azure Platform, a cloud-computing platform by Microsoft, offers 2 options to store data:
That's why I think it's hard to believe that Google App Engine doesn't offer a RDBMS. I searched, but found no confirmation. That's why I asked here
Spanner is Google's globally distributed relational database management system (RDBMS), the successor to BigTable.
There are three relational database options in Google Cloud: Cloud SQL, Cloud Spanner, and Bare Metal Solution. Cloud SQL: Provides managed MySQL, PostgreSQL and SQL Server databases on Google Cloud.
App Engine is a fully managed, serverless platform for developing and hosting web applications at scale. You can choose from several popular languages, libraries, and frameworks to develop your apps, and then let App Engine take care of provisioning servers and scaling your app instances based on demand.
Google Sheets is a cloud-based spreadsheet application that can store data in a structured way just like most database management systems. You can also edit and delete data with a couple of clicks and, on top of that, access your data online.
App Engine doesn't use an RDBMS, though we did just announce that we'll be supporting SQL in the near future in App Engine for Business. The App Engine datastore is based on Bigtable.
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