姓名     产品名称   数量
aaa           1             2
aaa           2             3
aaa           3             1
aaa           2             1
aaa           3             2
bbb           1             5
bbb           2             3
bbb           3             4
bbb           1             1

结果
aaa       1          2
aaa       2          4
aaa       3          3
bbb       1          6
bbb       2          3
bbb       3          4
请问各位这个sql语句该怎样写？