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Editorial Team
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Asked: 2026-05-27T03:14:19+00:00

I have a table with a primary key and row key column. The data

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I have a table with a primary key and row key column. The data looks like below. The data has already been loaded into a table that is a collection. 

Primary Key    Row Key
01000100001  000001 - Subject ID=1, Book ID=1, Chapter ID=1 and Page ID=1
01000100001  000002 - Subject ID=1, Book ID=1, Chapter ID=1 and Page ID=2
01000100001  000003 - Subject ID=1, Book ID=1, Chapter ID=1 and Page ID=3
01000100002  000004 - Subject ID=1, Book ID=1, Chapter ID=2 and Page ID=4
01000100002  000005 - Subject ID=1, Book ID=1, Chapter ID=2 and Page ID=5
01000100002  000006 - Subject ID=1, Book ID=1, Chapter ID=2 and Page ID=6
01000200003  000007 - Subject ID=1, Book ID=2, Chapter ID=3 and Page ID=7
01000200003  000008 - Subject ID=1, Book ID=2, Chapter ID=3 and Page ID=8
02000300004  000009 - Subject ID=2, Book ID=3, Chapter ID=4 and Page ID=9
02000300005  000010 - Subject ID=2, Book ID=3, Chapter ID=5 and Page ID=10

The collection class is called Pages and contains a column called PrimaryKey which is made up of the following:

2 column Subject ID
4 column Book ID
4 column Chapter ID

I need to create a report that looks something like the following and I am wondering
if and how I could create a query for this with LINQ. 

Subject  Books  Chapters      Pages

01         2         3           8
02         1         2           2

Any suggestions on how I could do this would be much appreciated.

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1 Answer

  1. Editorial Team

    You can use the group by and sum features the linq query would look something like this:

    from page in pages
group page by new { 
                    page.subjectId
                    , page.bookId
                    , page.chapterId 
                 } into group
select new {
             group.key.SubjectId
             , group.key.bookId
             , group.Key.chapterId
             , total = pages.sum(s => s.Page)
}

    Sorry that I don’t have visual studio available right now, but this should give you a pretty good start.

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