来帮我看看这个mysql语句该怎么写！

test
name add num

a wefsv 3

b asdf 4
b wers 9
b w1rs 10

as asdf 11
as wers 12
as w3rs 13

例如上面这个表，我需要用select * from test......

来选出如下结果（每个name中num最大的那个，只要一行,其它不管！）
a wefsv 3
b w1rs 10
as w3rs 13

再多此一问，如果要选择2行怎么办？

b wers 9
b w1rs 10

as wers 12
as w3rs 13

a wefsv 3

回复讨论(解决方案)

slect name,add,num from test group by add order by add desc

slect name,add,num from test group by add order by add desc

大神！不行啊！每个选出num不是最大的

每个name最大的一行
select *
from test a
where not exists (select 1 from test where name=a.name and num>a.num);

第一问

select * from (select * from test order by num desc) t group by name

name add   num a    wefsv 3 as   w3rs  13 b    w1rs  10 

第一问

select * from (select * from test order by num desc) t group by name

name add   num a    wefsv 3 as   w3rs  13 b    w1rs  10 

1 行

select * from test a where 0 = (select count(*) from test where name = a.name and num > a.num)

2 行

select * from test a where 2 > (select count(*) from test where name = a.name and num > a.num)

1 行

select * from test a where 0 = (select count(*) from test where name = a.name and num > a.num)

2 行

select * from test a where 2 > (select count(*) from test where name = a.name and num > a.num)

太牛了！昨天我弄了半小时都弄不出来！，谢谢！你这方法我感觉最好！

问题二

select * from test t where 2>(select count(*) from test where num>t.num and name=t.name);

name add   num a    wefsv 3 b    wers  9 b    w1rs  10 as   wers  12 as   w3rs  13 

所以问题一的又一写法是
select * from test t
where 1>(select count(*) from test1 where num>t.num and name=t.name)