SQL求和命令如何写

SQL求和命令怎么写
俩个字段
n0703 n0704
C0 238
A0 26
A0 17
A0 296
A0 299
A0 79
A0 20
A0 283.8
A0 7

SQL求和命令怎么写 求A0对应的值的和，谢谢各位了！！！




------解决方案--------------------
select sum(n0704) from n07 where n0703 = 'A0' and n0702='5-feb-09' ;