Select Top for Subquery with Entity Framework

Select Top for Subquery with Entity Framework

By : user2955857
Date : November 22 2020, 10:48 AM
fixed the issue. Will look into that further I have a Master-Detail model relationship set up in C# Entity Framework. One Master record might have multiple Detail records. I wish to bring back ALL Master records but only the first associated Detail record per Master record.
code :
   .Select(m => new{
       Master = m, 
       Detail = m.Details.OrderBy(d => d.StartDate).FirstOrDefault())

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Entity Framework - Many to Many Subquery

Entity Framework - Many to Many Subquery

By : posixpal
Date : March 29 2020, 07:55 AM
To fix this issue I asked a question about this previously but my database structure has changed, and while it made other things simpler, now this part is more complicated. Here is the previous question.
code :
var me = context
    .First(user => user.Email = "me@example.com");

// Note that there is no call to ToList() or AsEnumerable().
var myProjects = context
    .Where(project => project.Users.Contains(me));

var associatedUsers = context
    .Where(user => myProjects.Any(project => user.Project.Contains(project)));
var associatedUsers = myProjects
    .SelectMany(project => project.Users)
var myProjects = me.Projects;
Entity Framework subquery

Entity Framework subquery

By : Anndi Lomeland Jacob
Date : March 29 2020, 07:55 AM
will help you Guys I am new to Entity Framework and I'm having a bt of a problem that I have been trying to solve for quite a while. Basically I have 4 entities: users, groups, books and readingLists. A user can join a group and a group contains books - defined by readingList. I am trying to display a list of books for a specific group, the SQL looks like this: , I haven't tested it but hopefully it will work.
code :
b => entities.ReadingList.
Where(rl => rl.GroupId == groupId).
Select(rl => rl.BookId).
c# Entity Framework - linq to entity query with subquery

c# Entity Framework - linq to entity query with subquery

By : Owen Wang
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If I have the following tables/entities: , I would go for something along the lines of this
code :
from i in invoices
where i.Payments.Sum(p=>p.PaymentAmount) < i.InvoiceAmount
select i;
Using subquery in entity framework

Using subquery in entity framework

By : Giuseppe Rossi
Date : March 29 2020, 07:55 AM
Does that help I am trying to write the entity framework linq query to generate the following SQL. But I am not sure how to use subqueries with entity framework. , Here is the Full query
code :
var query = (from D in
                 ((from tab1 in DbContext.Table1
                   join tab2 in DbContext.Table2 on tab1.RefId equals tab2.RefId
                   where (tab1.StatusId == 4 || tab1.StatusId == 6)
                          && (tab1.StatusDate >= startDate && tab1.StatusDate <= endDate)
                   select new
                       RefId = tab1.RefId,
                       StatusId = tab1.StatusId,
                       StatusDate = tab1.StatusDate,
                       Reference = tab2.Reference,
                       LastChangeId = (from RSC in DbContext.StateChangeTable
                                       where RSC.RefId == tab1.RefId
                                       orderby RSC.ChangeId descending
                                       select RSC.ChangeId).FirstOrDefault()
             join RSC in DbContext.StateChangeTable on D.LastChangeId equals RSC.ChangeId
             select new StatusDetail
                 RefId = D.RefId,
                 StatusId = D.StatusId,
                 StatusDate = D.StatusDate,
                 Reference = D.Reference,
                 Event = RSC.Event,
                 Information = RSC.Information,
                 CreatedDate = RSC.CreatedDate
How to do subquery in entity framework .net

How to do subquery in entity framework .net

By : billy1977
Date : March 29 2020, 07:55 AM
around this issue Here's an example of the query I'm trying to convert to entity framework
code :
// Without relation between Teachers and General_Program:    
var teachers = _context.Teachers.Where(t => t.Dept_Name = "English" && _context.General_Program.Any(p => p.Campus_Name = t.Campus_Name && p.Teacher_id = t.Teacher_ID));

// When Teachers are related to General_Program (only on ID):
var teachers = _context.Teachers.Where(t => t.Dept_Name = "English" && t.General_Program.Any(p => p.Campus_Name = t.Campus_Name));

// In case of Teachers are related to General_Program (key contains both ID and campus):
var teachers = _context.Teachers.Where(t => t.Dept_Name = "English" && t.General_Program.Any());
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