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Finding Non-Matching Records

Author

Topic

evanburen
Posting Yak Master

167 Posts

Posted - 2014-12-16 : 15:35:21

Hi

I have two tables joined by the field name 'PCA' and I want to get a list of records which do not appear in the table named DataRequests (the first table) for a particular ReportPeriod.

For example, this produces the records that I want. Every PCA except ConServe, EOS-Collecto and Allied would be in my results.

SELECT
PCAs.PCA
FROM
DataRequests RIGHT OUTER JOIN PCAs ON DataRequests.PCA = PCAs.PCA
WHERE
(DataRequests.PCA IS NULL)

However, what I really need is every record which does not appear in the DataRequest table for a given ReportPeriod. So if @ReportPeriod = '12/15/2014' my results would be every PCA except Conserver and EOS-Collecto

Allied Interstate
Account Control Technology
CBE Group
Coast Prof
Collection Tech
Delta Mgmt
Diversified
Enterprise Recovery

SELECT
PCAs.PCA
FROM
DataRequests RIGHT OUTER JOIN PCAs ON DataRequests.PCA = PCAs.PCA
WHERE
(DataRequests.PCA IS NULL) AND [ReportPeriod] = @ReportPeriod

James K
Master Smack Fu Yak Hacker

3873 Posts

Posted - 2014-12-16 : 16:31:44

use one of these

SELECT
	PCAs.PCA
FROM
	PCAs
	LEFT JOIN DataRequests r ON
		r.ReportPeriod = @ReportPeriod
		AND r.PCA = PCAs.PCA
WHERE
	r.PCA IS NULL;
	

SELECT PCAs.PCA
FROM
	PCAs
WHERE
NOT EXISTS
( SELECT * FROM DataRequests r 
WHERE r.PCA = PCAs.PCA
AND r.ReportPeriod = @ReportPeriod
)

If there can be more than one record in the DataRequests table for a given PCA and ReportPeriod, you must use the second query.

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