J'ai cette requête dans LINQ to Entities. Je sais que c'est une sorte de requête "Evil" mais elle n'est utilisée que dans une interface d'administration. Mais le SQL généré est absolument horrifiant. Jetez un oeil à ce bébé.Optimize Grouper par dans LINQ to Entities
exec sp_executesql N'SELECT TOP (50)
[Project6].[C1] AS [C1],
[Project6].[TopicId] AS [TopicId],
[Project6].[C4] AS [C2],
[Project6].[subject] AS [subject],
[Project6].[name] AS [name],
[Project6].[forumName] AS [forumName],
[Project6].[C2] AS [C3]
FROM (SELECT
[Project5].[TopicId] AS [TopicId],
[Project5].[subject] AS [subject],
[Project5].[forumName] AS [forumName],
[Project5].[name] AS [name],
1 AS [C1],
CAST([Project5].[forumID] AS int) AS [C2],
[Project5].[C1] AS [C3],
[Project5].[C2] AS [C4]
FROM (SELECT
[Project4].[TopicId] AS [TopicId],
[Project4].[forumID] AS [forumID],
[Project4].[subject] AS [subject],
[Project4].[forumName] AS [forumName],
[Project4].[name] AS [name],
[Project4].[C1] AS [C1],
(SELECT
COUNT(cast(1 as bit)) AS [A1]
FROM [dbo].[tForumStats] AS [Extent14]
LEFT OUTER JOIN [dbo].[tTopic] AS [Extent15] ON [Extent14].[TopicId] = [Extent15].[topicID]
LEFT OUTER JOIN [dbo].[tForum] AS [Extent16] ON [Extent15].[forumID] = [Extent16].[forumID]
LEFT OUTER JOIN [dbo].[tForum] AS [Extent17] ON [Extent15].[forumID] = [Extent17].[forumID]
LEFT OUTER JOIN [dbo].[tForum] AS [Extent18] ON [Extent15].[forumID] = [Extent18].[forumID]
LEFT OUTER JOIN [dbo].[tForumGroup] AS [Extent19] ON [Extent18].[forumGroupID] = [Extent19].[forumGroupID]
LEFT OUTER JOIN [dbo].[tForum] AS [Extent20] ON [Extent15].[forumID] = [Extent20].[forumID]
LEFT OUTER JOIN [dbo].[tForumGroup] AS [Extent21] ON [Extent20].[forumGroupID] = [Extent21].[forumGroupID]
WHERE ([Extent14].[LogDate] >= @p__linq__25) AND ([Extent14].[LogDate] = @p__linq__25) AND ([Extent6].[LogDate] = @p__linq__25) AND ([Extent1].[LogDate]
je ne sais pas que quiconque d'expliquer cette requête, mais ce serait bien d'obtenir quelques conseils sur la façon de optimze la requête afin qu'il ne juste un régulier simple, rejoindre. Quelque chose comme ça fonctionne aussi bien si j'écris le SQL moi-même.
SELECT COUNT(*) AS NumberOfViews, s.topicid AS topicId, t.subject AS TopicSubject, g.[name] AS ForumGroupName, f.forumName AS ForumName
FROM tForumStats s
join tTopic t on s.topicid = t.topicid
join tForum f on f.forumid = t.forumid
JOIN tForumGroup g ON f.forumGroupID = g.forumGroupID
WHERE s.[LogDate] between @date1 AND @date2
group by s.topicid, t.subject, f.Forumname, t.Datum, g.[name]
order by count(*) desc
Btw, j'aime ce site. Conception étonnante et convivialité! Espérons que cela fonctionne bien pour obtenir de l'aide à :)
Hope, ressemble le site a coupé la grande requête générée bu Linq à ENTITES, je ne vous blâme pas. Je pense que vous avez l'idée .. – Olaj