LocalDB
Installing Microsoft LocalDB
Microsoft is no longer shipping separate MSI file for LocalDB it has to be installed either through Visual Studio installer or through SQL Server installer only.
If the default instance is not running properly, none of the repair steps will work and might not work even after reinstalling everything from scratch! Better create another instance as shown below:
Check running instances
SQLLocalDB info
Start an instance
SQLLocalDB start <instance_name>
Create a new instance
SQLLocalDB create MyInstance
SQLLocalDB start MyInstance
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