What would be the linq equivalent to the below sql?

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How do I convert this sql query to linq equivalent? I have included my models. I am using EF code first from database. I am new to c# programming so I may not know what to include in my questions. Thank you

SELECT        RestaurantFranchiseeEmail.Email
FROM            RestaurantVersions INNER JOIN
                     RestaurantFranchiseeEmail ON 
RestaurantVersions.RestaurantId = RestaurantFranchiseeEmail.RestaurantId
WHERE        (RestaurantVersions.VersionId = N'M1')
GROUP BY RestaurantFranchiseeEmail.Email, RestaurantVersions.VersionId

Models

 namespace 
    {
        using System.ComponentModel.DataAnnotations;

        public class RestaurantVersion
    {
        public int Id { get; set; }

        [StringLength(50)]
        public string RestaurantId { get; set; }

        [StringLength(150)]
        public string Franchisee { get; set; }

        [StringLength(150)]
        public string VersionId { get; set; }
    }
}

   namespace 
    {
        using System.ComponentModel.DataAnnotations;
        using System.ComponentModel.DataAnnotations.Schema;

    [Table("RestaurantFranchiseeEmail")]
    public class RestaurantFranchiseeEmail
    {
        public int Id { get; set; }

        [StringLength(50)]
        public string RestaurantId { get; set; }

        [StringLength(150)]
        public string Franchisee { get; set; }

        [StringLength(150)]
        public string Email { get; set; }
    }
}

Try this code:

from s in RestaurantVersions 
          join c in RestaurantFranchiseeEmail on s.RestaurantId equals c.RestaurantId
         where c.VersionId == "M1"
           group c by s.Email && c.VersionId
        select c.Email;

What is the linq equivalent of the below sql query, Assuming SelectedProducts is an array of product ids (integers): var cats = db.​Categories.Where(o => SelectedProducts.Contains(o. It sometimes helps you with the equivalent and you can practice the query and see the final result in sql – Zinov Feb 6 at 2:11 Perhaps using my SQL to LINQ Recipe would help you. – NetMage Feb 6 at 19:51

Since there isn't much detail to the question, I'm going to base my answer off of Entity Framework using ViewModels:

var result = _context.RestaurantVersions
    .Where(restaurantVersion => restaurantVersion.VersionId == "M1")
    .Select(restaurantVersion => new RestaurantVersionViewModel
    {
        VersionId = restaurantVersion.VersionId,
        RestaurantFranchiseeEmailViewModel = new RestaurantFranchiseeEmailViewModel
        {
            Email = restaurantVersion.RestaurantFranchiseeEmail.Email
        }
    })
    .GroupBy(restaurantVersionViewModel => new
        { 
            restaurantVersionViewModel.VersionId, 
            restaurantVersionViewModel.RestaurantFranchiseeEmailViewModel.Email 
        })
    .ToList()

This is untested and assumes a lot. Pure stab in the dark.

Edit: You'll have to grab the email out of the grouping.

Practical Database Programming With Visual C#.NET, The LINQ to SQL or the Standard Query Operators will interface to these entity classes to perform In other words, each entity class can be mapped or is equivalent to a physical data table in the described in the sequence listed below: 1. The LINQ query, which we had here, will be translated into T-SQL by the underlying LINQ to SQL provider. What we want to do is to write that generated SQL statement to ASP.NET Web page. To achieve this, we will use Logproperty of datacontextobject.

 var  query = from s in RestaurantVersions 
              join q in RestaurantFranchiseeEmail 
              on s.RestaurantId = 
                 q.RestaurantId
              where s.VersionId = N'M1'
              group q by q.Email
              select  q.Email;

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[SOLVED], How can I write below sql query in linq select * from Product where ProductTypePartyID IN ( select Id from ProductTypeParty where PartyId = 34 ). LINQ stands for Language Integrated Query and LINQ to SQL is an ORM (Object Relational Mapping), which is a component of .Net Framework. It automatically creates strongly typed .Net classes from the database tables thus enabling us to query the database tables using .net supported languages like C#, VB, etc.

Why LINQ beats SQL, In the case of LINQ to SQL or Entity Framework, the translation engine will convert the query (that we composed in two Compare this to the SQL equivalent: This answer would have been correct had the question been about Linq-to-SQL or Linq in general. However, since it specifically says "Linq-to-Entities", this answer is incorrect. array.Contains is not (yet) supported by Linq-to-Entities. – KristoferA May 29 '09 at 7:04

Complex Query Operators, Language Integrated Query (LINQ) contains many complex It requires you to get all of the data from the server to do GroupJoin without a special selector (first query below). It uses HAVING clause in SQL for the where clause. EF Core identifies such patterns and generates the equivalent LEFT JOIN  LINQ has a JOIN operator that performs an INNER JOIN of two or more tables based on matching keys from the tables. The examples below show the LINQ code in C# and the SQL syntaxes that are equivalent to the LINQ queries. Example #1. INNER JOIN from two tables

LINQ to SQL: JOIN Table Examples (C#) - Querychat, Learn with examples in C#: LINQ to SQL on JOIN operations. The JOINs that will be covered include INNER JOIN (two and multiple tables), The examples below show the LINQ code in C# and the SQL syntaxes that are equivalent to the​  This Linq query is the same as the following SQL: SELECT Items.* FROM TagMaps INNER JOIN Items ON Item.ItemId = TagMap.ItemId WHERE TagMaps.TagId IN (12,32,24) Linq takes care of the INNER JOIN part for you, because it knows how to go from TagMap to Item.

Comments
  • Usen the linqpad. It sometimes helps you with the equivalent and you can practice the query and see the final result in sql
  • Perhaps using my SQL to LINQ Recipe would help you.
  • Thank you for that!