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我对两个查询使用相同的表和列，但我有不同的别名和 avg 函数。我如何能够将这两个查询与 UNION ALL 结合起来，因为我想要从它们中选择的每一行。显然，当我有不同的选择语句时，我不能这样做。我怎样才能结合这两个查询？

SELECT GRADE_TYPE_CODE, ROUND(TO_CHAR(NUMERIC_GRADE),2) AS GRADE
FROM GRADE
WHERE STUDENT_ID = 10 AND SECTION_ID = 5
ORDER BY GRADE_TYPE_CODE DESC,NUMERIC_GRADE DESC;



SELECT 'Average is:' AS GRADE_TYPE_CODE,AVG(GRADE) AS GRADE
FROM
(
    SELECT AVG(NUMERIC_GRADE) AS GRADE
FROM GRADE
WHERE STUDENT_ID = 10 AND SECTION_ID = 5
GROUP BY GRADE_TYPE_CODE
) myInnerTable;
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2 回答 2

3

不知道这里有什么问题。为什么不在两个查询之间加上“union all”，然后将 ORDER BY 子句移到末尾？

SELECT GRADE_TYPE_CODE, ROUND(TO_CHAR(NUMERIC_GRADE),2) AS GRADE
FROM GRADE
WHERE STUDENT_ID = 10 AND SECTION_ID = 5

union all

SELECT 'Average is:' AS GRADE_TYPE_CODE,AVG(GRADE) AS GRADE
FROM
(
    SELECT AVG(NUMERIC_GRADE) AS GRADE
FROM GRADE
WHERE STUDENT_ID = 10 AND SECTION_ID = 5
GROUP BY GRADE_TYPE_CODE
) myInnerTable

order by 1 desc, 2 desc

http://sqlfiddle.com/#!4/99a16/19/0

于 2013-11-02T01:47:27.037 回答
1

我想你可以创建一个临时表，然后从两个单独的查询中合并 ALL。

于 2013-11-02T01:26:44.667 回答