(localdb)\ ProjectsV12和(localdb)\ ProjectsV13实例是由SQL Server数据工具(SSDT)创建的，不应由应用程序使用

The (localdb)\ProjectsV12 and (localdb)\ProjectsV13 instances are created by SQL Server Data Tools (SSDT) and should not be used by applications

(localdb)\ MSSQLLocalDB是SQL Server Express 2014/2016 LocalDB的默认实例名称和自动实例".

(localdb)\MSSQLLocalDB is the SQL Server Express 2014/2016 LocalDB default instance name and an "automatic instance".

您可以使用sqllocaldb.exe命令行工具来管理拥有MSSqlLocaldb实例的版本(2014或2016)

You can use the sqllocaldb.exe command line tool to manage which version (2014 or 2016) owns the MSSqlLocaldb instance

(localdb)\ v11.0是SQL Server 2012 LocalDB默认实例名称

And (localdb)\v11.0 is the SQL Server 2012 LocalDB default instance name