如何結合這兩個查詢

Question

我對兩個查詢使用相同的表和列，但是別名和平均值函數不同。 如何將這兩個查詢與UNION ALL結合使用，因為我希望從它們中選擇每一行。 顯然，當我有不同的選擇語句時，我做不到。 我如何結合這兩個查詢？

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;

Answer 1

不知道這里是什么問題。 為什么不只在兩個查詢之間放置“全部聯合”，然后將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

Answer 2

我在想您可以創建一個臨時表 ，然后從兩個單獨的查詢中合並所有。