本文只是記錄個人使用SqlLocalDB過程中的一些有趣現象，並不一定適用所有情況。關於SqlLocalDB工具的具體使用，參見: SQL Server LocalDB 入門 及 SqlLocalDB Utility。

1. 當本地安裝多個版本的SQL Server LocalDB時，無法建立低版本的名為MSSQLLocalDB的預設例項(注: LocalDB的第一個版本是SQL Server 2012, 預設例項名是v11.0, 從SQL Server 2014開始，預設例項名修改成了MSSQLLocalDB), 也無法通過指定Version建立該預設例項。但是不指定Version或者通過SSMS連線(localdb)\MSSQLLocalDB
   卻可以建立該例項。

   C:\>SqlLocalDB versions
   Microsoft SQL Server 2016 (13.1.4001.0)
   Microsoft SQL Server 2017 (14.0.1000.169)
   
   C:\>SqlLocalDB info
   MSSQLLocalDB
   ProjectsV13
   
   C:\>SqlLocalDB delete MSSQLLocalDB
   Delete of LocalDB instance "MSSQLLocalDB" failed because of the following error:
   The specified LocalDB instance does not exist.
   
   C:\>SqlLocalDB create MSSQLLocalDB 13.1
   Creation of LocalDB instance "MSSQLLocalDB" failed because of the following error:
   The parameter for the LocalDB Instance API method is incorrect. Consult the API documentation.
   
   C:\>SqlLocalDB create MSSQLLocalDB 13.1.4001.0
   Creation of LocalDB instance "MSSQLLocalDB" failed because of the following error:
   The parameter for the LocalDB Instance API method is incorrect. Consult the API documentation.
   
   C:\>SqlLocalDB create MSSQLLocalDB 14.0
   Creation of LocalDB instance "MSSQLLocalDB" failed because of the following error:
   The parameter for the LocalDB Instance API method is incorrect. Consult the API documentation.
   
   C:\>SqlLocalDB create MSSQLLocalDB 14.0.1000.169
   Creation of LocalDB instance "MSSQLLocalDB" failed because of the following error:
   The parameter for the LocalDB Instance API method is incorrect. Consult the API documentation.
   
   C:\>SqlLocalDB create MSSQLLocalDB
   LocalDB instance "MSSQLLocalDB" created with version 14.0.1000.169.
    
   

2. 雖然安裝了多個版本的SQL Server LocalDB, 但是卻不能建立同名例項，試著建立同名例項，返回訊息也不一樣。

   C:\>SqlLocalDB create MyDataBase 13.1
   LocalDB instance "MyDataBase" created with version 13.1.4001.0.
   
   C:\>SqlLocalDB create MyDataBase 14.0
   Creation of LocalDB instance "MyDataBase" failed because of the following error:
   Unable to create the LocalDB instance with specified version. An instance with the same name already exists, but it has lower version than the specified version.
   
   C:\>SqlLocalDB create MySQLDB
   LocalDB instance "MySQLDB" created with version 14.0.1000.169.
   
   C:\>SqlLocalDB create MySQLDB 13.1.4001.0
   LocalDB instance "MySQLDB" created with version 14.0.1000.169.
   
   C:\>SqlLocalDB info
   MSSQLLocalDB
   MyDataBase
   MySQLDB
   ProjectsV13
   
   C:\>SqlLocalDB info MyDataBase
   Name:               MyDataBase
   Version:            13.1.4001.0
   Shared name:
   Owner:              XXXXXXXXXX
   Auto-create:        No
   State:              Stopped
   Last start time:    2020/8/23 11:14:50
   Instance pipe name:
   
   C:\>SqlLocalDB info MySQLDB
   Name:               MySQLDB
   Version:            14.0.1000.169
   Shared name:
   Owner:              XXXXXXXXXX
   Auto-create:        No
   State:              Stopped
   Last start time:    2020/8/23 11:15:42
   Instance pipe name:
    
   

3. 無意中發現，原來CMD也支援管道，好吧, 認知再一次被重新整理(另: 預設例項MSSQLLocalDB的Auto-create屬性是Yes, 其他的是No)！

   C:\>SqlLocalDB info MSSQLLocalDB | sort
   Auto-create:        Yes
   Instance pipe name:
   Last start time:    2020/8/23 10:56:20
   Name:               MSSQLLocalDB
   Owner:              XXXXXXXXXX
   Shared name:
   State:              Stopped
   Version:            14.0.1000.169
   
   C:\>SqlLocalDB info | sort
   MSSQLLocalDB
   MyDataBase
   MySQLDB
   ProjectsV13