How to display Text Unit only one time if it repeated for same Feature when do stuff? - tsql

Question

I work with SQL Server 2012 and face an issue: I can't display Text Unit only one time where it repeated for feature using Stuff.
What I need is when Text Unit is repeated for same feature, then no need to repeat it - only display it once.
In my case, I face issue that I can't prevent repeat Text Unit when It be same Text Unit for same Feature.
Voltage | Voltage | Voltage ONLY one Voltage display .
CREATE TABLE #FinalTable
(
PartID INT,
DKFeatureName NVARCHAR(100),
TextUnit NVARCHAR(100),
StatusId INT
)
INSERT INTO #FinalTable (PartID, DKFeatureName, TextUnit, StatusId)
VALUES
(1211, 'PowerSupply', 'Voltage', 3),
(1211, 'PowerSupply', 'Voltage', 3),
(1211, 'PowerSupply', 'Voltage', 3)
SELECT
PartID, DKFeatureName,
COUNT(PartID) AS CountParts,
TextUnit = STUFF ((SELECT ' | ' + TextUnit
FROM #FinalTable b
WHERE b.PartID = a.PartID
AND a.DKFeatureName = b.DKFeatureName
AND StatusId = 3
FOR XML PATH('')), 1, 2, ' ')
INTO
#getUnitsSticky
FROM
#FinalTable a
GROUP BY
PartID, DKFeatureName
HAVING
(COUNT(PartID) > 1)
SELECT *
FROM #getUnitsSticky
Expected result is :
Voltage
Incorrect result or result I don't need is as below :
Voltage|Voltage|Voltage

Answer 1

TomC's answer is basically correct. However, when using this method with SQL Server, it is usually more efficient to get the rows in a subquery and then use stuff() in the outer query. That way, the values in each row are processed only once.
So:
SELECT PartID, DKFeatureName, CountParts,
STUFF( (SELECT ' | ' + TextUnit
FROM #FinalTable b
WHERE b.PartID = a.PartID AND
b.DKFeatureName = a.DKFeatureName AND
StatusId = 3
FOR XML PATH('')
), 1, 3, ' ') as TextUnit
INTO #getUnitsSticky
FROM (SELECT PartID, DKFeatureName, COUNT(*) as CountParts
FROM #FinalTable a
GROUP BY PartID, DKFeatureName
HAVING COUNT(*) > 1
) a;
This also removes the leading space from the concatenated result.

Answer 2

To put this into a complete answer - this should be your SQL (shortened slightly and removed the last temp table):
SELECT
PartID, DKFeatureName,
COUNT(PartID) AS CountParts,
TextUnit = STUFF ((SELECT distinct ' | ' + TextUnit
FROM #FinalTable b
WHERE b.PartID = a.PartID
AND a.DKFeatureName = b.DKFeatureName
AND StatusId = 3
FOR XML PATH('')), 1, 2, ' ')
FROM #FinalTable a
GROUP BY PartID, DKFeatureName
HAVING (COUNT(PartID) > 1)