MySql汇总列的元素

Question

我有一个包含3列（A，B，C）的表。我想从表中选择一些行，然后在MySQL中返回一行，每行都添加了值......

   A B C
1. 2 2 2
2. 4 4 4
3. 6 6 6

如果我选择所有三行，

MySql应该返回：

   A   B  C
1. 12  12 12

Answer 1

 select sum(A),sum(B),sum(C) from mytable where id in (1,2,3);

Answer 2

select
  sum(a) as atotal,
  sum(b) as btotal,
  sum(c) as ctotal
from
  yourtable t
where
  t.id in (1, 2, 3)

Answer 3

试试这个：

select sum(a), sum(b), sum(c)
from your_table