----------------------------
-- Author  :fredrickhu(小F，向高手学习)
-- Date    :2011-08-09 16:14:38
-- Verstion:
--      Microsoft SQL Server 2008 (RTM) - 10.0.1600.22 (Intel X86) 
--    Jul  9 2008 14:43:34 
--    Copyright (c) 1988-2008 Microsoft Corporation
--    Enterprise Evaluation Edition on Windows NT 5.1 <X86> (Build 2600: Service Pack 3)
--
----------------------------
--> 测试数据：[a]
if object_id('[a]') is not null drop table [a]
go 
create table [a]([a] varchar(3),[b] int)
insert [a]
select 'aaa',3 union all
select 'bbb',2 union all
select 'ccc',1
--> 测试数据：[b]
if object_id('[b]') is not null drop table [b]
go 
create table [b]([a] varchar(3),[b] int)
insert [b]
select 'aaa',20 union all
select 'aaa',33 union all
select 'aaa',55 union all
select 'aaa',77 union all
select 'aaa',88 union all
select 'bbb',33 union all
select 'bbb',99 union all
select 'bbb',11 union all
select 'ccc',22 union all
select 'ccc',34
--------------开始查询--------------------------
select 
  a.a,b.b
from
  a
join
(
select
  a,(select COUNT(distinct b) from b where a=t.a and b>=t.b) as numb,b
from
  b t
)b
on
  a.a=b.a
where
  b.numb<=a.b

----------------结果----------------------------
/* a    b
---- -----------
aaa  88
aaa  77
aaa  55
bbb  99
bbb  33
ccc  34

(6 行受影响)
*/

------解决方案--------------------

SQL code
----------------------------
-- Author  :fredrickhu(小F，向高手学习)
-- Date    :2011-08-09 16:14:38
-- Verstion:
--      Microsoft SQL Server 2008 (RTM) - 10.0.1600.22 (Intel X86) 
--    Jul  9 2008 14:43:34 
--    Copyright (c) 1988-2008 Microsoft Corporation
--    Enterprise Evaluation Edition on Windows NT 5.1 <X86> (Build 2600: Service Pack 3)
--
----------------------------
--> 测试数据：[a]
if object_id('[a]') is not null drop table [a]
go 
create table [a]([a] varchar(3),[b] int)
insert [a]
select 'aaa',3 union all
select 'bbb',2 union all
select 'ccc',1
--> 测试数据：[b]
if object_id('[b]') is not null drop table [b]
go 
create table [b]([a] varchar(3),[b] int)
insert [b]
select 'aaa',20 union all
select 'aaa',33 union all
select 'aaa',55 union all
select 'aaa',77 union all
select 'aaa',88 union all
select 'bbb',33 union all
select 'bbb',99 union all
select 'bbb',11 union all
select 'ccc',22 union all
select 'ccc',34
--------------开始查询--------------------------
select 
  a.a,b.b
from
  a
join
(
select
  a,(select COUNT(distinct b) from b where a=t.a and b>=t.b) as numb,b
from
  b t
)b
on
  a.a=b.a
where
  b.numb<=a.b

----------------结果----------------------------
/* a    b
---- -----------
aaa  88
aaa  77
aaa  55
bbb  99
bbb  33
ccc  34

(6 行受影响)
*/