Pivot function in SQL Server

 https://www.selectdistinct.co.uk/2023/05/22/pivot-function-in-sql/

Struct vs class

 https://www.geeksforgeeks.org/c-sharp-structures-set-1/

Types in C#

 https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/types#81-general