Visual Studio 2013 Querybuider

I am using a databound gridview to display information about ongoing projects. The data is primarily pulled from the tProjects table but associated with several other tables, one of which is tComments. There can be multiple comments per project. Currently the gridview is displaying one line for each project/comment pair so that if there are three comments on a project there are three lines displayed. I need to limit the display to 1 row with only the most recent comment. I've tried using  TOP in several ways but can't seem to get it to work.

This is the SQL that displays 1 row per project/comment pair. How would I modify it to limit the display to the most recent comment?

SELECT       tUsers.strUserName AS [Section Lead], tLocations.strLocation AS Location,
                    tProjects.strDWGNumber AS [Drawing Number], tProjectStatuses.strStatus AS Status,
                    tProjects.dteDueDate AS [Due Date], tProjects.intProjectID, tComments.strComment AS
                    Comment, tComments.dtmDateEntered AS [Comment Date]
FROM         tProjects INNER JOIN tUsers ON tProjects.intUserID = tUsers.intUserID INNER JOIN
                    tProjectStatuses ON tProjects.intProjectStatusID = tProjectStatuses.intProjectStatusID
                    INNER JOIN tLocations ON tUsers.intLocationID = tLocations.intLocationID INNER JOIN
                    tComments ON tProjects.intProjectID = tComments.intProjectID
WHERE      (tProjects.dteDueDate < @Today)
ORDER BY [Due Date], Location, [Comment Date] DESC

Thanks
OhioWoodWrightAsked:
Who is Participating?
 
Vitor MontalvãoMSSQL Senior EngineerCommented:
You can use Common Table Expression (CTE) to get the last comment for each Project and then use it on your SELECT:
WITH CTE_ProjComment (intProjectID, CommentDate)
AS (
	SELECT tComments.intProjectID, MAX(tComments.dtmDateEntered AS [Comment Date])
	FROM tProjects 
		INNER JOIN tComments ON tProjects.intProjectID = tComments.intProjectID
	GROUP BY tComments.intProjectID)

SELECT tUsers.strUserName AS [Section Lead], tLocations.strLocation AS Location,
       tProjects.strDWGNumber AS [Drawing Number], tProjectStatuses.strStatus AS Status,
       tProjects.dteDueDate AS [Due Date], tProjects.intProjectID, 
       tComments.strComment AS Comment, MCTE_ProjComment.CommentDate AS[Comment Date]
FROM tProjects 
	INNER JOIN tUsers ON tProjects.intUserID = tUsers.intUserID 
	INNER JOIN tProjectStatuses ON tProjects.intProjectStatusID = tProjectStatuses.intProjectStatusID 
	INNER JOIN tLocations ON tUsers.intLocationID = tLocations.intLocationID 
	INNER JOIN tComments c ON tProjects.intProjectID = tComments.intProjectID
	INNER JOIN CTE_ProjComment ON tComments.intProjectID = CTE_ProjComment.intProjectID
WHERE (tProjects.dteDueDate < @Today)
ORDER BY [Due Date], Location, [Comment Date] DESC

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Lokesh B RDeveloperCommented:
SELECT       TOP 1 (tUsers.strUserName AS [Section Lead], tLocations.strLocation AS Location,
                    tProjects.strDWGNumber AS [Drawing Number], tProjectStatuses.strStatus AS Status,
                    tProjects.dteDueDate AS [Due Date], tProjects.intProjectID, tComments.strComment AS
                    Comment, tComments.dtmDateEntered AS [Comment Date])
FROM         tProjects INNER JOIN tUsers ON tProjects.intUserID = tUsers.intUserID INNER JOIN
                    tProjectStatuses ON tProjects.intProjectStatusID = tProjectStatuses.intProjectStatusID
                    INNER JOIN tLocations ON tUsers.intLocationID = tLocations.intLocationID INNER JOIN
                    tComments ON tProjects.intProjectID = tComments.intProjectID
WHERE      (tProjects.dteDueDate < @Today)
ORDER BY  [tComments.dtmDateEntered] DESC
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OhioWoodWrightAuthor Commented:
Thanks for the suggestion but when I try that I get the following error:

The following errors were encountered while parsing the contents of the SQL pane:
      Error in SELECT clause: expression near 'AS'.
      Missing FROM clause.
      Error in SELECT clause: expression near ','.
      Unable to parse query text.
0
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Lokesh B RDeveloperCommented:
Hi,
Sorry, try this

SELECT       TOP 1 (tUsers.strUserName AS [Section Lead], tLocations.strLocation AS Location,
                    tProjects.strDWGNumber AS [Drawing Number], tProjectStatuses.strStatus AS Status,
                    tProjects.dteDueDate AS [Due Date], tProjects.intProjectID, tComments.strComment AS
                    Comment, tComments.dtmDateEntered AS [Comment Date]
FROM         tProjects INNER JOIN tUsers ON tProjects.intUserID = tUsers.intUserID INNER JOIN
                    tProjectStatuses ON tProjects.intProjectStatusID = tProjectStatuses.intProjectStatusID
                    INNER JOIN tLocations ON tUsers.intLocationID = tLocations.intLocationID INNER JOIN
                    tComments ON tProjects.intProjectID = tComments.intProjectID
WHERE      (tProjects.dteDueDate < @Today))
ORDER BY  [tComments.dtmDateEntered] DESC
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OhioWoodWrightAuthor Commented:
Un fortunately I get the same error
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OhioWoodWrightAuthor Commented:
OK, I finally got this to run without error but it only shows 1 project not all projects with the latest comment for each project.

SELECT TOP(1)      tUsers.strUserName AS [Section Lead], tLocations.strLocation AS Location,
                     tProjects.strDWGNumber AS [Drawing Number], tProjectStatuses.strStatus AS Status,
                     tProjects.dteDueDate AS [Due Date], tProjects.intProjectID, tComments.strComment AS
                     Comment, tComments.dtmDateEntered AS [Comment Date]
 FROM         tProjects INNER JOIN tUsers ON tProjects.intUserID = tUsers.intUserID INNER JOIN
                     tProjectStatuses ON tProjects.intProjectStatusID = tProjectStatuses.intProjectStatusID
                     INNER JOIN tLocations ON tUsers.intLocationID = tLocations.intLocationID INNER JOIN
                     tComments ON tProjects.intProjectID = tComments.intProjectID
 WHERE      (tProjects.dteDueDate < @Today)
 ORDER BY [Due Date], Location, [Comment Date] DESC

Any help would be greatly appreciated.
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Anthony PerkinsCommented:
Try it this way:
SELECT  u.strUserName [Section Lead],
        l.strLocation Location,
        p.strDWGNumber [Drawing Number],
        s.strStatus [Status],
        p.dteDueDate AS [Due Date],
        p.intProjectID,
        c.strComment Comment,
        c.dtmDateEntered [Comment Date]
FROM    tProjects p
        INNER JOIN tUsers u ON p.intUserID = u.intUserID
        INNER JOIN tProjectStatuses s ON p.intProjectStatusID = s.intProjectStatusID
        INNER JOIN tLocations l ON u.intLocationID = l.intLocationID
        INNER JOIN tComments c ON tProjects.intProjectID = tComments.intProjectID
        INNER JOIN (SELECT  intProjectID,
                            MAX(c.dtmDateEntered) LastDateEntered
                    FROM    tComments
                    GROUP BY intProjectID
                   ) c2 ON p.intProjectID = c2.intProjectID
                           AND c.dtmDateEntered = c2.LastDateEntered
WHERE   p.dteDueDate < @Today

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