Pranav Bilurkar Pranav Bilurkar - 5 months ago 15
SQL Question

How to handle empty rows in CROSS APPLY [SQL Server]

I've below

Stored Procedure
-

ALTER PROCEDURE [dbo].[Optimized_GetArticlePostAMP]
(
@PostID int
)

AS
BEGIN
SET NOCOUNT ON;
SET STATISTICS TIME ON

DECLARE @SectionId int ,@datediff int
DECLARE @postdate datetime

SELECT P.PostId, P.SectionID, P.PostName,MP.MetaTitle,P.Postdate,P.PostAuthor,P.IsApproved,
MP.Metadescription, MP.Metakeywords,ISNULL(MP.IsRobotsMetaTag,0) as IsRobotsMetaTag,p.TotalViews, P.Subject, P.FormattedBody,
MV.Isvideo,MV.VideoCode,MV.VideoCaption, A.DrComment,A.SpanishURL, PS.RedirectUrl, Isnull(PS.IsRedirect,0) as IsRedirect,
ISNULL(A.CommentedBy,38633) as CommentedBy ,MP.Canonical as Canonical,ISNULL(MP.RRpopUP ,0) as RRpopUP,ISNULL(A.PrevPost,0) as PreviousPostId,
ISNULL(A.NextPost,0) as NextPostId,PS.StatusId ,dbo.[mercola_GetCommentCountForPost](@PostId) as TotalReplies, isnull(PA.[FileName],'') as FileName,
PRD.StoryImage, PRD.StoryContent, ISNULL(NULLIF(prd.ALT, ''), P.Subject) AS ALT, ISNULL(PR.ReferenceData,'')as ReferenceData,
MH.LastModifiedDate,
CASE WHEN CHARINDEX('<p><strong>By', FormattedBody, -1)=1 THEN LTRIM(SUBSTRING(REPLACE(CAST(FormattedBody as varchar(max)),'<p><strong>By ',''),0,CHARINDEX('<',REPLACE(cast(FormattedBody as varchar(max)),'<p><strong>By ',''))))
ELSE 'Dr.Mercola' END as Name
FROM cs_posts P
LEFT JOIN Mercola_NewsletterDetails A on (P.Postid = A.postid)
LEFT JOIN Mercola_PostStatus PS on (PS.postid=p.postid)
LEFT JOIN Mercola_PostMetatags MP on(P.postid=MP.Postid)
LEFT JOIN Mercola_postVideo MV on(P.postid=MV.Postid)
LEFT JOIN CS_PostAttachments PA on P.PostId=PA.PostId AND PA.contenttype LIKE 'audio/mpeg' AND PA.FILENAME LIKE '%.mp3' AND PA.isremote = 1
LEFT JOIN Mercola_PostRelatedData PRD on P.PostId=PRD.PostId
LEFT JOIN Mercola_PostReferences PR on P.PostId=PR.PostId
CROSS APPLY (select top 1 LastModifiedDate from Mercola_ArticleModifiedHistory where Mercola_ArticleModifiedHistory.Postid = P.postid order by LastModifiedDate desc)MH
where P.Postid = @Postid


Now, When i
execute
the above
SP
with the below
PostID
-

--[Mercola_Optimized_GetArticlePostAMP] 732490
i get the below data which is
expected
. As, the query inside
cross apply
has data for the above
postID
.

enter image description here

But now, when i
execute
the same
SP
with below different
PostID
-

--[Mercola_Optimized_GetArticlePostAMP] 40702
i get below
empty data [rows]
. As, the query inside
cross apply
does not have the data for the above
postID
Infact, other
joins
have the data.

enter image description here

Expected Result for above case -
Return the data and assigning default value for the
CROSS APPLY
. How can i do it. Please help..!!

Answer

Use OUTER APPLY instead of CROSS APPLY

To overrun NULLs use ISNULL(MH.LastModifiedDate, @DefaultValue) as LastModifiedDate

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