求sql合计查询语句，如下
表A (客户表)
ID,NAME（销售名）, NUMBER
1, 'ZHANG', 1
2, 'LI' , 1
3, 'ZHANG' ,1
4, 'ZHANG' ,1
5, 'WANG' ,2

表B（合同表）
AID,NUM
2，1
3，2
效果如下：


name, 合同总数（A.ID=B.AID） 客户总数（A） 成单率
'ZHANG' 2 3 66.7%
'LI' 0 1 0
'WANG' 0 1 0 sql sql语句
[解决办法]
你的例子是不是有错啊？

----------------------------
-- Author  :DBA_Huangzj()
-- Date    :2013-01-15 20:21:54
-- Version:
--      Microsoft SQL Server 2008 R2 (SP1) - 10.50.2500.0 (Intel X86) 
--Jun 17 2011 00:57:23 
--Copyright (c) Microsoft Corporation
--Enterprise Edition on Windows NT 6.1 <X86> (Build 7601: Service Pack 1)
--
----------------------------
--> 测试数据：[表A]
if object_id('[表A]') is not null drop table [表A]
go 
create table [表A]([ID] int,[NAME] varchar(5),[NUMBER] int)
insert [表A]
select 1,'ZHANG',1 union all
select 2,'LI',1 union all
select 3,'ZHANG',1 union all
select 4,'ZHANG',1 union all
select 5,'WANG',2
--> 测试数据：[表B]
if object_id('[表B]') is not null drop table [表B]
go 
create table [表B]([AID] int,[NUM] int)
insert [表B]
select 2,1 union all
select 3,2
--------------开始查询--------------------------

select NAME,SUM(num) as [合同总数],COUNT(name) AS 客户总数,ISNULL(LEFT (CONVERT(VARCHAR(20),(SUM(num)*1./COUNT(name))),4),0)+'%' 成单率
from [表A] a LEFT JOIN [表B] b ON a.id=b.aid
GROUP BY name
----------------结果----------------------------
/* 
NAME  合同总数        客户总数        成单率
----- ----------- ----------- ---------
LI    1           1           1.00%
WANG  NULL        1           0%
ZHANG 2           3           0.66%
警告: 聚合或其他 SET 操作消除了 Null 值。

(3 行受影响)
*/

也可以创建个临时表：#表名，先group by 到临时表，再用联查语句 inner join（内连接），或左连接，2表联查。。
[解决办法]
要加上DISTINCT 排重。

USE test
GO


-->生成表A

if object_id('A') is not null 
drop table A
Go
Create table A([ID] smallint,[NAME] nvarchar(9),[NUMBER] smallint)
Insert into A
Select 1,N'ZHANG',1
Union all Select 2,N'LI',1
Union all Select 3,N'ZHANG',1
Union all Select 4,N'ZHANG',1
Union all Select 5,N'WANG',2

-->生成表B

if object_id('B') is not null 
drop table B
Go
Create table B([AID] smallint,[NUM] smallint)
Insert into B
Select 2,1
Union all Select 3,2

SELECT 
name
,COUNT(b.NUM) AS [合同总数]
,COUNT(DISTINCT a.ID)AS [客户总数]
,LTRIM(CONVERT(NUMERIC(5,2),COUNT(b.NUM)*100.0/COUNT(DISTINCT a.ID)))+'%'AS [成单率]
FROM A
LEFT JOIN B AS b ON a.ID=b.AID
GROUP BY NAME
ORDER BY MIN(ID)

/*
name      合同总数        客户总数        成单率
--------- ----------- ----------- ------------------------------------------
ZHANG     1           3           33.33%
LI        1           1           100.00%
WANG      0           1           0.00%
*/