Additional workloads can be installed via the Visual Studio Installer by selecting the Modify option.
In order to create the UWP application, you'll need to install the UWP workload:
You may wish to download the data tools for Visual Studio:
Alternatively, you could download SQL Server Management Studio, which can be found here: https://docs.microsoft.com/en-us/sql/ssms/download-sql-server-management-studio-ssms.