return join table row values as comma-delim list in one column

I have the below query which returns a dataset such as this:

1      2      2      10      2012-03-26 14:12:10.000
1      2      2      40      2012-03-26 14:12:10.000
1      2      2      60      2012-03-26 14:12:10.000

This is because the m table has one row that matches @clientmedicationid, and the b table contains three rows that relate to the m table record foreign key. This is correct.

I want to instead return one row representing the m table, and show the b table 10,40 and 60 values as a comma delimited list in one column of that row. There could be up to 9 possible values/rows in b table for each unique row in m.

Thanks.


SELECT m.new_currentmedication, m.new_takingasindicated, m.new_doctordiscontinued, b.new_reasonfornoncompliance, m.createdon
FROM new_medicationcompliance m WITH (NOLOCK)
JOIN new_medcompliancereasonformednoncompliance b WITH (NOLOCK)
ON b.new_medicationcompliancereviewid = m.new_medicationcomplianceid
WHERE m.new_clientmedicationid = @clientmedicationid
AND m.deletionstatecode <> 2
AND m.statecode = 0

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Sailing_12PirateAsked:
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lluddenCommented:
Create a function to collate the values:
CREATE FUNCTION [dbo].ItemsForKey
(
    @clientmedicationid INT,
    @new_currentmedication INT,
    @new_takingasindicated INT,
    @new_doctordiscontinued INT
)
RETURNS VARCHAR(MAX)
AS
BEGIN
	DECLARE @ItemList VARCHAR(200)
	SELECT @ItemList = coalesce(@ItemList + ',', '') + cast(b.new_reasonfornoncompliance AS VARCHAR(10))
	FROM new_medicationcompliance m WITH (NOLOCK)
		JOIN new_medcompliancereasonformednoncompliance b WITH (NOLOCK) ON b.new_medicationcompliancereviewid = m.new_medicationcomplianceid
	WHERE m.new_clientmedicationid = @clientmedicationid
		AND m.deletionstatecode <> 2
		AND m.statecode = 0
		AND m.new_currentmedication = @new_currentmedication
		AND m.new_takingasindicated = @new_takingasindicated
		AND m.new_doctordiscontinued = @new_doctordiscontinued
	RETURN (@ItemList)
END  

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Then call it in your query:
SELECT m.new_currentmedication,
	   m.new_takingasindicated,
	   m.new_doctordiscontinued,
	   [dbo].ItemsForKey(@clientmedicationid, m.new_currentmedication, m.new_takingasindicated, m.new_doctordiscontinued) AS ItemList,
	   m.createdon
FROM new_medicationcompliance m WITH (NOLOCK)
	JOIN new_medcompliancereasonformednoncompliance b WITH (NOLOCK) ON b.new_medicationcompliancereviewid = m.new_medicationcomplianceid
WHERE m.new_clientmedicationid = @clientmedicationid
	AND m.deletionstatecode <> 2
	AND m.statecode = 0

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Scott PletcherSenior DBACommented:
SELECT m.new_currentmedication, m.new_takingasindicated, m.new_doctordiscontinued,
    (SELECT TOP 100 PERCENT CAST(b.new_reasonfornoncompliance AS varchar(10)) +
         CASE WHEN b.new_reasonfornoncompliance < (SELECT MAX(bMax.new_reasonfornoncompliance)
             FROM new_medcompliancereasonformednoncompliance bMax
             WHERE bMax.new_medicationcompliancereviewid = b.new_medicationcompliancereviewid)
         THEN ', ' ELSE '' END
     FROM new_medcompliancereasonformednoncompliance b WITH (NOLOCK)
     WHERE b.new_medicationcompliancereviewid = m.new_medicationcomplianceid
     ORDER BY b.new_reasonfornoncompliance
     FOR XML PATH('')
    ) AS ReasonsForNoncompliance,
    m.createdon
FROM new_medicationcompliance m WITH (NOLOCK)
WHERE m.new_clientmedicationid = @clientmedicationid
AND m.deletionstatecode <> 2
AND m.statecode = 0
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Microsoft SQL Server

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