https://learn.microsoft.com/tr-tr/dotnet/api/system.data.common.commandtrees.dbgroupbyexpression?view=netframework-4.8.1
DbGroupByExpression Class (System.Data.Common.CommandTrees) | Microsoft Learn
Represents a group by operation. A group by operation is a grouping of the elements in the input set based on the specified key expressions followed by the...
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