Lifting and shifting a database
If you’re migrating an application to the cloud and your application stack includes a SQL Server database, Azure provides the widest variety of options of any public cloud provider for you to migrate that database to.
If you have a fairly simple schema you might be able to migrate straight to the PaaS (platform-as-a-service) option, Azure SQL Databases, to offload some of the maintenance burden onto Microsoft and lower your total cost of ownership. This is something you should definitely look to do, if you can. However, larger applications with a more complex data schema may have difficulty migrating straight into Azure SQL Databases. This service is multi-tenant, so the T-SQL allowed is not the same as the on-premises SQL Server you might be used to.