Azure SQL Database is a cloud-based data-storage service from Microsoft. It’s based on a special version of Microsoft’s SQL Server. It’s basically a stripped-down SQL Server with certain limitations in place.
We support SQL Azure directly in our products! You don't need separate drivers and can immediately connect to your database.
Azure SQL Database changed its name several times. It was known as SQL Azure in the past.
High availability is provided by storing multiple copies of databases, elastic scale and rapid provisioning. T-SQL can still be used as the query language, as well as stored procedure language. Certain system procedures are no longer available in the cloud version of the database, but overall parity is very high and SQL Server developers should have no problem working with Azure SQL Database.