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Dynamic Pivot Table woes

Posted on 2014-12-23
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Last Modified: 2014-12-26
Please excuse this newbie's ignorance...
I've looked at several examples and still can't wrap my head around Pivot tables.

I created a view:
SELECT        dbo.tblPMIInspection.PMIInspID, dbo.tblElement.Element, dbo.tblPMIReadings.Reading
FROM            dbo.tblPMIInspection INNER JOIN
                         dbo.tblPMIReadings ON dbo.tblPMIInspection.PMIInspID = dbo.tblPMIReadings.PMIInspID INNER JOIN
                         dbo.tblElement ON dbo.tblPMIReadings.ElementID = dbo.tblElement.ElementID

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Element to be the column headings, Reading to be column result, PMIInspID is the Group By column

The column names NEED to be dynamic due to possible increase in number of elements being read etc.

How do I get from
SELECT        PMIInspID, Element, Reading
FROM            vwPMIReadings

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to...
Pivot Table Results
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Question by:Kurt Bergman
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10 Comments
 
LVL 24

Expert Comment

by:Phillip Burton
ID: 40516156
Dynamic PivotTables are hard, and if you are a newbie, it's possibly too hard.

Have a read of this article, and once your brain has exploded, if you have any questions, please post them (though I'm taking Christmas off): http://www.experts-exchange.com/Database/MS-SQL-Server/SQL-Server-2005/A_653-Dynamic-Pivot-Procedure-for-SQL-Server.html
0
 
LVL 18

Expert Comment

by:Simon
ID: 40516268
Philip's suggested link is a good one, or Google for "TSQL pivot dynamic column names" for other simple examples.
If you can post a sample dataset from your view (with no commercially sensitive data in it) we'll be able to provide a worked example for your data.
0
 
LVL 35

Expert Comment

by:ste5an
ID: 40516333
Well, the number of elements is not dynamic..

Please use table alias names, this increases readability:

SELECT	I.PMIInspID, 
		E.Element, 
		R.Reading
FROM	dbo.tblPMIInspection I
	INNER JOIN dbo.tblPMIReadings R ON I.PMIInspID = R.PMIInspID 
	INNER JOIN dbo.tblElement E ON R.ElementID = E.ElementID;

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This should work:

 
DECLARE @ColumList NVARCHAR(MAX) = N'';
DECLARE @SqlStatement NVARCHAR(MAX) = N'
	SELECT 	*
	FROM	vwPMIReadings
	PIVOT	( SUM(Reading) FOR Element IN ( @ColumnList ) ) P;
';

SELECT	@ColumnList = @ColumnList + ', ' + Element
FROM	vwPMIReadings
GROUP BY Element;

SET @SqlStatement = REPLACE(@SqlStatement, '@ColumnList', STUFF(@ColumnList, 1, 2, ''));

EXECUTE (@SqlStatement);

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LVL 18

Accepted Solution

by:
Simon earned 2000 total points
ID: 40516359
@Ste5an:  Good thinking :)
one typo in line 1 of  your code:
DECLARE @ColumnList NVARCHAR(MAX) = N''; -- was missing 'n' in the variable name
0
 

Author Comment

by:Kurt Bergman
ID: 40516560
I'm on vacation until Friday I'll get back to you as soon as possible
0
 

Author Closing Comment

by:Kurt Bergman
ID: 40518610
Simon,
Thank you very much!

The Elements are dynamic because number and names will change depending on the site where the software is deployed.

Also,
There is only one 'Reading' for each Element for a given Inspection (InspID). Thus the need to use MAX (or Min) instead of SUM

SELECT       *
      FROM      vwPMIReadings
      PIVOT      ( max(Reading) FOR Element IN ( @ColumnList ) ) P;
      ';
0
 
LVL 18

Expert Comment

by:Simon
ID: 40518801
Hi ConcordCA - It really should be Ste5an getting most or all of the points here. I only pointed out a minor typo.
0
 

Author Comment

by:Kurt Bergman
ID: 40518824
Oops... I meant for it to be Ste5an
Is there a way to change it?
0
 
LVL 35

Expert Comment

by:ste5an
ID: 40519016
I don't care that much..

Just use alias names in your queries for better readable code and I'm happy :)
0
 

Author Comment

by:Kurt Bergman
ID: 40519034
Epilogue:
This is being displayed in an Access datasheet subform.
I'm looping through the Field names in the view I created to set the Form.Control.ControlSource.  From there I can using the results from the SQL statement you provided to set the Form.Recordset.

It's working great. Thank you again!
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