Microsoft® SQL Azure™ Database is a cloud-based relational database service (RDBMS) built on SQL Server® technologies. It is a highly available, scalable, multi-tenant database service hosted by Microsoft in the cloud. SQL Azure Database helps to ease provisioning and deployment of multiple databases. Developers do not have to install, setup, patch or manage any software, as all that is taken care of by Microsoft with this platform as a service (PAAS). High availability and fault tolerance is built-in and no physical administration is required.
Customers can use existing knowledge in T-SQL development and a familiar relational data model for symmetry with existing on-premises databases. Additionally, customers can get productive on SQL Azure quickly by using the same development and management tools they use for on-premises databases services.