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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 15:59pm
Andy_L_J20.4K
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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 17-Feb-13 6:22am
   
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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 17-Feb-13 6:22am
   
5+

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