Distinct on Multiple Columns Entity Framework LINQ

Linq query in Entity Framework multiple children entities include()

Use ...extension methods.... Replace ...NameOfContext... with the name of your object context....public static class Extensions{ public static IQueryable<Company> CompleteCompanies(this NameOfContext context){ return context.Companies .Include("Employee.Employee_Car") .Include("Employee.Employee_Country") ; ...

Linq to Entities vs. Linq to SQL vs. Entity Framework

There are two ways of writing queries with Entity Framework:...Linq to Entities ( ...http://msdn.microsoft.com/en-us/library/bb386964.aspx... )...Entity SQL ( ...http://msdn.microsoft.com/en-us/library/bb387145.aspx... )...L2E is not a separate technology, but rather a part of EF....Have a look at this article for a comparison: ...http://thedatafar...

DISTINCT on one column in LINQ to Entities

Use something like...db.Table1.Select(t => t.Column1).Distinct() ...As Munim mentioned in his comment, the Distinct() method does add the DISTINCT to the query. So resulting SQL query will be...SELECT [Distinct1].[Column1] AS [Column1] FROM ( SELECT DISTINCT [Extent1].[Column1] AS [Column1] FROM [dbo].[Table1] AS [Extent1] ) AS [Disti...

The LINQ expression node type 'Invoke' is not supported in the entity framework's LINQ to Entities.

This problem can be solved using the AsExpandable() method present in LINQKIT by Joe Albahari. He's the same creator of ...PredicateBuilder... that I see you're using....If querying with Entity Framework, change the last line to this:...return objectContext.Products.AsExpandable().Where(predicate);...You can grab LINQKIT DLL ...here... or install i...

Ordering in Linq to Entities Multiple Columns

If ...Date... is nullable you could do something like this:...var qry = ctx.DestinationTimings.Where(x => x.DestinationID == this.ID) .OrderBy(t => t.Date ?? DateTime.MaxValue) .ThenBy(t => SqlFunctions.CharIndex(t.DayOfWeek + ",", "MON,TUE,WED,THU,FRI,SAT,SUN")) .ThenBy(t => t.Time);

Entity Framework LINQ joining 5 tables on multiple columns (impossible?!)

Write this query:... var match = from t1 in context.cKNA1 join t2 in context.cKNB1 on new { t1.KUNNR, t1.RowId } equals new { t2.KUNNR, t2.RowId } join t3 in context.cKNVV on new { t2.KUNNR, t2.RowId } equals new { t3.KUNNR, t3.RowId } ...

Select distinct on one column only using Entity Framework Code First

After our coop, the final query is:...var query = context.Messages .Where(x => x.IsAFriendshipRequest == false && x.SentTo == userId).Include("SentByUser") .Select(x => new { User = x.SentBy, x.DateUtcSent, x.Body, Name = x.SentByUser.Name }) .Union ( context.Messages .Where(x => x.IsAFriendshipRequest == false &...

how to select distinct values in a column in entity framework?

Add ToList() call at the end of the expression to materialize the query: ...var contractors = context.ManHoursWorked.Where(j => j.JOCID == jocID).Select(c => c.ContractorName).Distinct().ToList();

Entity Framework - how to query over multiple tables and choose columns to display

you can do it easly ...Linq query... or ...lambda expressions... over the dbContext classes mapped to the database....check this it would be help you ...Entity Framework Join 3 Tables...How to join multiple tables?

Select multiple columns from table based on different set of multiple columns

I'm trying to get query like this from LINQ/EF6 in C#...SELECT "ID_column" FROM "Entity" WHERE ("ColumnA","ColumnB") IN (('Value_0_0','Value_0_1'),('Value_1_0','Value_1_1'), ...); ...But I'm getting the following error for the code bellow...Unable to create a constant value of type 'Anonymous type'. Only primitive types or enumeration types are s...