如何在MySQL中按SUM（）排序？

Question

我有一张桌子：“ ID名称c_counts f_counts”

我想按顺序排序所有记录，sum(c_counts+f_counts) 但这不起作用：

SELECT * FROM table ORDER BY sum(c_counts+f_counts) LIMIT 20;

Answer 1

别忘了，如果要混合使用分组（即SUM）字段和非分组字段，则需要对非分组字段之一进行GROUP BY。

尝试这个：

SELECT SUM(something) AS fieldname
FROM tablename
ORDER BY fieldname

或这个：

SELECT Field1, SUM(something) AS Field2
FROM tablename
GROUP BY Field1
ORDER BY Field2

而且，您始终可以执行以下派生查询：

SELECT
   f1, f2
FROM
    (
        SELECT SUM(x+y) as f1, foo as F2
        FROM tablename 
        GROUP BY f2
    ) as table1
ORDER BY 
    f1

许多可能性！