Question

我需要分组年份，并选择每年平均值的最后五年，以便我有平均和年份输出

SELECT AP, yr
FROM (
SELECT Year AS yr, AVG( "tbltest.AskingPrice" ) AS AP
FROM tbltest
GROUP BY `yr` DESC
LIMIT 5
)sub
GROUP BY `yr` ASC

Answer 1

我认为你的子查询符合你的要求：

SELECT Year AS yr, AVG( "tbltest.AskingPrice" ) AS AP
FROM tbltest
GROUP BY `yr`
ORDER BY Year DESC
LIMIT 5;

我刚将desc移到order by以与标准SQL保持一致。

Answer 2

SELECT sub.yr, sub.AP
FROM (
    SELECT Year AS yr, AVG(AskingPrice) AS AP
    FROM tbltest
    GROUP BY yr
    ORDER BY yr DESC
    LIMIT 0,5
) sub
ORDER BY sub.yr ASC

我需要分组年份，并选择每年平均值的最后五年，以便我有平均和年份输出

2 个答案: