求一个sql语句，麻烦大家了，谢谢

现在数据格式如下，需要将数据累加，结果如下
3
6
5
3

mysql> SELECT o.xs, o.s, o.m, o.l, o.xl, o.xxl, o.xxxl FROM xxxxxx o;

+------+-------+------+------+------+------+------+
| xs | s | m | l | xl | xxl | xxxl |
+------+-------+------+------+------+------+------+
| | 1 | 2 | | | | |
| 1,2, | ,3, | ,, | ,, | ,, | ,, | ,, |
| | 2 | 3 | | | | |
| | | 1 | 2 | | | |
| | 1 | 2 | | | | |
| | | 2 | 3 | | | |
| 1 | 2 | 3 | | | | |
| 1,, | 1,2,2 | ,3,2 | ,, | ,, | ,, | ,, |
+------+-------+------+------+------+------+------+




[解决办法]
create table ss(xs int,s int);
insert into ss select 2,0 union all
select 1,20 union all select 3,5;
select sum(xs+s) from ss group by xs;

====

query result(3 records)
sum(xs+s)
21
2
8

[解决办法]
再想想
[解决办法]
用存储过程，