このSQLをLINQに変換できますか？

Question

私はLINQに翻訳したいと思っている非常に扱いにくいSQL-Queryで作業しています。

あなたは可能でしょうか？

WITH ConditionalChecks AS (
    SELECT c.ItemId FROM ConditionalProperties c, Properties p 
    WHERE c.PropertyId = p.Id AND c.IsChecked = 1 AND (

     (p.SystemName = 'eatable') OR 
     (p.SystemName = 'diy') 

    ) 
), 

ConditionalCount AS (
    SELECT ItemId, Count(*) AS NumTrue FROM ConditionalChecks 
    GROUP BY ItemId 
), 

ItemResult AS (
    SELECT * FROM ConditionalCount c, Items i 
    WHERE c.ItemId = i.Id 
) 

SELECT * FROM ItemResult 
WHERE NumTrue = 2 

ヒントありがとうございます！

Answer 1

LINQを使用すると、このようなクエリを簡単に集約できます。

var conditionalChecksQuery = 
    from c in db.ConditionalProperties 
    where c.IsChecked == 1 // or 'true', if boolean 
    join p in db.Properties on c.PropertyId equals p.Id 
    where p.SystemName == "eatable" || p.SystemName == "diy" 
    select c.ItemId; 

var conditionalCountQuery = 
    from c in conditionalChecksQuery 
    group c by c.ItemId into cGrouped 
    select new { ItemId = cGrouped.Key, NumTrue = cGrouped.Count() }; 

var itemResultQuery = 
    from c in conditionalCountQuery 
    join i in db.Items on c.ItemId equals i.Id 
    select new { Item = i, NumTrue = c.NumTrue }; 

var finalQuery = 
    from result in itemResultQuery 
    where result.NumTrue == 2 
    select result; 

Answer 2

は、私はこのような何かが、これはSQLで

Select * FROM (
    Select c.ItemID, Count(*) As NumTrue 
    FROM ConditionalProperties c, Properties p 
    WHERE c.PropertyId = p.Id AND c.IsChecked = 1 AND (
    (p.SystemName = 'eatable') OR 
    (p.SystemName = 'diy') 
    GROUP BY ItemID 
) AS ConditionalCount 
INNER JOIN Items AS I 
ON ConditionalCount.ItemID = I.id 
WHERE ConditionalCount.NumTrue = 2 

動作するはずです、私はあなたがLINQをしていたと思って、SQLを望んでいた理由は分からないと思いますが、これはSQLのはるかに単純な形であるべき複数のクエリとまったく同じことをします。