Choose a cloud SQL Server option: Azure SQL (PaaS) Database or SQL Server on Azure VMs (IaaS)
PaaS: Azure SQL Database
SQL Database, based on Microsoft SQL Server technologies.
MySQL Database, based on the ClearDB MySQL Database cloud service
Azure SQL Database architecture starts with an Azure subscription. Within the subscription, there is a resource group and within the resource group there are server instances and databases.
Azure SQL Database Architecture
Planning Azure SQL Databases
IaaS: SQL Server on Azure Virtual Machines