Question

最初我正在处理两个查询，一个人回来了学生的分数，第二个是返回Grand Total Marks。

现在我决定联合这两个查询，但我的Grand Total行出现在顶部，我想在底部，我尝试更改两个的排序，但对结果没有影响。请提出建议，我的疑问是：

SELECT AISECTRESULT_Schemes.SUBNO, 
        AISECTRESULT_Schemes.SUBJECT, 
        AISECTRESULT_Schemes.CE_TotalMarks, 
        AISECTRESULT_ExamMarksData.TotalMarksObt_C, 
        AISECTRESULT_Schemes.TE_TotalMarks, 
        AISECTRESULT_ExamMarksData.TotalMarksObt,
        MAXMARKS, 
        AISECTRESULT_ExamMarksData.OverAllMarks 
  FROM AISECTRESULT_Schemes 
 INNER JOIN AISECTRESULT_ExamMarksData 
    ON AISECTRESULT_Schemes.[EXAMSCHEME ID] = AISECTRESULT_ExamMarksData.EXAMSCHEMEID
 WHERE (AISECTRESULT_ExamMarksData.REGISTRATIONID = '201192145')

UNION

SELECT ''AS SUBNO,
       ''AS SUBJECT,
        SUM(AISECTRESULT_Schemes.CE_TotalMarks)CE_TotalMarks, 
        SUM(AISECTRESULT_ExamMarksData.TotalMarksObt_C)TotalMarksObt_C,
        SUM(AISECTRESULT_Schemes.TE_TotalMarks)TE_TotalMarks, 
        SUM(AISECTRESULT_ExamMarksData.TotalMarksObt)TotalMarksObt,
        SUM(AISECTRESULT_Schemes.MAXMARKS)MAXMARKS,
        SUM(AISECTRESULT_ExamMarksData.OverAllMarks)OverAllMarks
  FROM AISECTRESULT_Schemes
 INNER JOIN AISECTRESULT_ExamMarksData
    ON AISECTRESULT_Schemes.[EXAMSCHEME ID] = AISECTRESULT_ExamMarksData.EXAMSCHEMEID
 WHERE (AISECTRESULT_ExamMarksData.REGISTRATIONID = '201192145')

enter image description here

Answer 1

如果没有显式 ORDER BY，查询结果的排序是任意的。

现在你可能会注意到总是的排序似乎是相同的，但是要保证：添加数据或更改聚簇索引或者什么会使你认为理所当然的订单无效。

通常，您可以通过

解决此问题

添加虚拟列以对进行排序（如果没有合理的现有列可供选择）
对该列进行明确排序

示例

SELECT 1 AS ToSortOn, ... FROM ... UNION ALL SELECT 2 AS ToSortOn, ... FROM ... ORDER BY ToSortOn

Answer 2

虽然不是最好的方法......

UNION ALL

Answer 3

您的查询需要ORDER BY。这应该这样做：

SELECT  SUBNO, 
        SUBJECT, 
        CE_TotalMarks, 
        TotalMarksObt_C, 
        TE_TotalMarks, 
        TotalMarksObt,
        MAXMARKS, 
        OverAllMark
FROM (  SELECT  AISECTRESULT_Schemes.SUBNO, 
                AISECTRESULT_Schemes.SUBJECT, 
                AISECTRESULT_Schemes.CE_TotalMarks, 
                AISECTRESULT_ExamMarksData.TotalMarksObt_C, 
                AISECTRESULT_Schemes.TE_TotalMarks, 
                AISECTRESULT_ExamMarksData.TotalMarksObt,
                MAXMARKS, 
                AISECTRESULT_ExamMarksData.OverAllMarks,
                1 ColOrder
        FROM AISECTRESULT_Schemes 
        INNER JOIN AISECTRESULT_ExamMarksData 
        ON AISECTRESULT_Schemes.[EXAMSCHEME ID] = AISECTRESULT_ExamMarksData.EXAMSCHEMEID
        WHERE AISECTRESULT_ExamMarksData.REGISTRATIONID = '201192145'

        UNION

        SELECT  ''AS SUBNO,''AS SUBJECT,
                SUM(AISECTRESULT_Schemes.CE_TotalMarks)CE_TotalMarks, 
                SUM(AISECTRESULT_ExamMarksData.TotalMarksObt_C)TotalMarksObt_C,
                SUM(AISECTRESULT_Schemes.TE_TotalMarks)TE_TotalMarks, 
                SUM(AISECTRESULT_ExamMarksData.TotalMarksObt)TotalMarksObt,
                SUM(AISECTRESULT_Schemes.MAXMARKS)MAXMARKS,
                SUM(AISECTRESULT_Exa![enter image description here][1]mMarksData.OverAllMarks)OverAllMarks,
                2
        FROM AISECTRESULT_Schemes 
        INNER JOIN AISECTRESULT_ExamMarksData 
        ON AISECTRESULT_Schemes.[EXAMSCHEME ID] = AISECTRESULT_ExamMarksData.EXAMSCHEMEID 
        WHERE AISECTRESULT_ExamMarksData.REGISTRATIONID = '201192145') AS Data
ORDER BY ColOrder

为什么UNION结果不会出现在底部？

3 个答案: