来自查询的mysql sum值

Question

mysql查询如下：

SELECT count(f.id) as total, m1.fname FROM members m1 INNER JOIN new f ON m1.id = f.id

该查询的结果：

   total | fname  | 
  ------------------
    2    |  john
    3    |  mike
    5    |  july

如何使用此mysql查询对“total”列中的值进行求和？

Answer 1

在子查询上使用SUM：

SELECT SUM(c.total) AS total_sum
FROM (
    SELECT count(f.id) as total, m1.fname
    FROM
        members m1 INNER JOIN
        new f ON m1.id = f.id
) AS c

Answer 2

您应该使用sum（）而不是count（）。你查了一下吗？

SELECT sum(f.id) as total, m1.fname FROM members m1 INNER JOIN new f ON m1.id = f.id