How do I use Linq and Entity Framework to join two jointables?

Question

I have a very normalized database, and I\'m trying to join two join tables together.

My goal is to only show documents that the user has permission to. I\'m using Ent

Answer 1

You can also view the SQL generated by EF 4.1 using either

• SQL Profiler
• LINQPad

Although, at this time, you need to use the LINQPad beta for EF 4.1.

Regarding your second question, I believe your query would translate fine. Using LINQPad to check the SQL, the following query

var a1 = Addresses.Where(a => a.City.ToUpper().EndsWith("L")).Select(a => a.AddressID);
var a2 = Addresses.Where(a => a.City.ToUpper().StartsWith("B")).Select(a => a.AddressID);

var x1 = a1.Intersect(a2);

translates to

SELECT 
[Intersect1].[AddressID] AS [C1]
FROM  (SELECT 
    [Extent1].[AddressID] AS [AddressID]
    FROM [Person].[Address] AS [Extent1]
    WHERE UPPER([Extent1].[City]) LIKE N'%L'
INTERSECT
    SELECT 
    [Extent2].[AddressID] AS [AddressID]
    FROM [Person].[Address] AS [Extent2]
    WHERE UPPER([Extent2].[City]) LIKE N'B%') AS [Intersect1]

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I think @Slauma's recommendation to use navigation proeprties is the way to go if your model supports it.

Still, get LINQPad - you won't regret it :)