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I have a Table; Material_Price with the following structure:
 
Material_ID, EffectiveDate, Price
 
In TSQL I do this:
 
  DECLARE @Id INT = 1
 
  SELECT Price
    FROM Material_Price
    WHERE Material_ID = @Id
      AND EffectiveDate = (SELECT (MAX)EffectiveDate
                             FROM Material_Price
                             WHERE Material_ID = @Id
                               AND EffectiveDate <= GetDate())
 
 
What is the equivalent in a linq query?
Posted 16-Feb-13 16:59pm
Andy_L_J19.1K
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Solution 1

Typed over my head (might have some error), should be something like:
var effDate = (from mp in dataContext.Material_Price
               where mp.Material_ID = @id and mp.EffectiveDate <= DateTime.Now
               select mp.EffectiveDate).Max();
			   
var query = from mp  in dataContext.Material_Price
            where mp.Material_ID = @id and effDate.Contains(mp.EffectiveDate)
	    select mp.Price;
 

A helpful tool: LinqPad[^]
 
Just in case needed, following articles would help:
Learn SQL to LINQ (Visual Representation)[^]
Converting SQL to LINQ, Part 1: The Basics (Bill Horst)[^]
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Monjurul Habib at 17-Feb-13 6:22am
   
5+
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Solution 2

With a few minor changes, here is the completed snippet:
 
  var effDate = (from mp in db.Material_Price
	          where mp.Material_ID == id && mp.EffectiveDate <= DateTime.Now
                  select mp.EffectiveDate).Max();
 
  var query = from mp  in db.Material_Price
		where mp.Material_ID == id 
                  && effDate.CompareTo(mp.EffectiveDate) == 0
		select mp.Price;  
 
Thanks Sandeep, magic!
 
I was hoping however that it could be done with a single statement.
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v2
Comments
Monjurul Habib at 17-Feb-13 6:22am
   
5+

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