select @@VERSION

Microsoft SQL Server 2014 - 12.0.2254.0 (X64) 
Jul 25 2014 18:52:51 
Copyright (c) Microsoft Corporation
Developer Edition (64-bit) on Windows NT 6.3 <X64> (Build 9600: )

In an attempt to correct many perceived deficiencies in Entity Framework Core, Microsoft is introducing 40 breaking changes to EF Core 3. You can see the entire breaking changes list on Microsoft Docs, but here are some of the highlights. 

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