Error: "Multiple columns are specified in an aggregated expression containing an outer reference."

sql sql-server tsql aggregation
frontin picture frontin · Oct 23, 2014 · Viewed 8.6k times · Source

Hi I am receiving this error when trying to execute the query below. Any ideas or suggestions?

Error:"Multiple columns are specified in an aggregated expression containing an outer reference. If an expression being aggregated contains an outer reference, then that outer reference must be the only column referenced in the expression."

SELECT TestInstances.pkTestInstanceID AS 'pkTestInstanceID',
               bands.pkPerformanceLevelReportBandID AS 'BandID',
               bands.StackPosition AS 'StackPosition',
               (SELECT TOP 100 PERCENT SUM(CASE WHEN bands.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1 ELSE COUNT(StudentScores_Subject.pkStudentScoreID) END
                FROM PerformanceLevelReportBands b 
                WHERE b.fkPerformanceLevelReportID = @intPerfLevelReportId
                ORDER BY SUM(CASE WHEN bands.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1 ELSE COUNT(StudentScores_Subject.pkStudentScoreID) END) AS 'Percent',
         COUNT(StudentScores_Subject.pkStudentScoreID) AS 'Count'
         FROM StudentScores_Subject
                INNER JOIN StudentTests ON StudentScores_Subject.fkStudentTestID = StudentTests.pkStudentTestID
                INNER JOIN TestInstances ON  TestInstances.pkTestInstanceID = StudentTests.fkTestInstanceID
                INNER JOIN CAHSEE_TestPeriods ON CAHSEE_TestPeriods.pkTestPeriodID = TestInstances.fkTestPeriodID
                INNER JOIN PerformanceLevelReportBands bands ON bands.fkPerformanceLevelReportID = @intPerfLevelReportId
                LEFT JOIN MMARS_Web_TestInfo_California.dbo.PerfLevelReportBandCutScores cutScores ON cutScores.fkPerformanceLevelReportBandID = bands.pkPerformanceLevelReportBandID
                    AND cutScores.fkGradeID = @intGradeId
                    AND cutScores.fkTestSubjectID IN (SELECT id FROM @tempSubs)
                INNER JOIN PerfLevelReportBandComponents bandComponents ON bandComponents.fkPerformanceLevelReportBandID = bands.pkPerformanceLevelReportBandID 
                    AND((bandComponents.ScoreValue = StudentScores_Subject.ScoreValue) OR 
                        ((CAST(StudentScores_Subject.ScoreValue AS INT) BETWEEN bandComponents.minScore and bandComponents.maxScore)
                          OR 
                         (CAST(StudentScores_Subject.ScoreValue AS INT) BETWEEN cutScores.minScore and cutScores.maxScore)))
                RIGHT JOIN MM_SchoolYears ON MM_SchoolYears.pkSchoolYearID = TestInstances.fkSchoolYearID
        WHERE MM_SchoolYears.pkSchoolYearID IN (SELECT number FROM itot(@strYearIds, N','))
                AND StudentScores_Subject.fkStudentTestID IN (SELECT id FROM @tempTests)
                AND StudentScores_Subject.fkScoreTypeID = bandComponents.fkScoreTypeID
                AND StudentScores_Subject.fkTest_SubjectID IN (SELECT id FROM @tempSubs)
        GROUP BY TestInstances.pkTestInstanceID, bands.pkPerformanceLevelReportBandID, bands.StackPosition
        ORDER BY TestInstances.pkTestInstanceID, bands.pkPerformanceLevelReportBandID, bands.StackPosition

Answer

Mihai picture Mihai · Oct 23, 2014

The problem is here you cant combine an outer and inner reference in an aggregate function

(SELECT TOP 100 PERCENT SUM(CASE WHEN bands.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE

WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1

ELSE COUNT(StudentScores_Subject.pkStudentScoreID)

 END
   FROM PerformanceLevelReportBands b
   WHERE b.fkPerformanceLevelReportID = @intPerfLevelReportId
   ORDER BY SUM(CASE WHEN bands.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE

WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1

ELSE COUNT(StudentScores_Subject.pkStudentScoreID)

END) AS 'Percent'

So change it to

(SELECT TOP 100 PERCENT SUM(CASE WHEN bb.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE

  WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1

  ELSE COUNT(StudentScores_Subject.pkStudentScoreID)

 END
   FROM PerformanceLevelReportBands b JOIN PerformanceLevelReportBands bb
    ON bb.fkPerformanceLevelReportID =bands.fkPerformanceLevelReportID 
    AND b.fkPerformanceLevelReportID =bb.fkPerformanceLevelReportID
   WHERE b.fkPerformanceLevelReportID = @intPerfLevelReportId
   ORDER BY SUM(CASE WHEN bb.StackPosition = b.StackPosition THEN 1 ELSE 0 END) * 100/ CASE

 WHEN COUNT(StudentScores_Subject.pkStudentScoreID) = 0 THEN 1

 ELSE COUNT(StudentScores_Subject.pkStudentScoreID)

 END) AS 'Percent'

Here is a more thorough explanation.

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