Question

I am trying to do lookup cross 2 tables using Entity Framework unfortunately I couldn’t find way but I do have sql query which does what I want

SQL Query

select top(1) p1.Percentage
from LookupTable p1 , [lookupTablePerUnit] p2
where p2.[LookupValue] <= @Value1  and p1.ID=p2.[LookupID]
order BY pr.range DESC

if @Value1= 6 then The result = 52

Here is a screenshot of two tables (lookupTable && LookTablePerUnit) using this query

(SELECT * FROM [DB].[dbo].[lookupTablePerUnit] p1 , [DB].[dbo].[LookupTable] p2
where p1.LookupTableID = p2.ID)

http://s15.postimage.org/m80zvn4mx/Captur2e.png

Answer 1

A join (your query is using the implicit join syntax for SQL) would look very similar in Linq to Entities:

var query = from p1 in context.LookupTable 
            join p2 in context.lookupTablePerUnit on p1.ID equals p2.LookupID
            where p2.LookupValue <= Value1
            orderby p1.range descending
            select p1.Percentage;

var result = query.FirstOrDefault();

Had to take a guess on the range property you have a typo in your question so its not clear whether it can be attributed to LookupTable or lookupTablePerUnit