BCP xp_cmdshell

---------------------- 从现有表导出结果 ----------------------
-- 将AdventureWorks.HumanResources.Employee表的数据导出到C:\test.xls
EXEC master..xp_cmdshell ' BCP "select * from AdventureWorks.HumanResources.Employee" queryout C:\test.xls -c  -SCN110075 -Usa -Pchang' 

-- 删除C:\test.xls
EXEC master..xp_cmdshell 'del C:\test.xls '

---------------------- 从全局临时表表导出结果 ----------------------
-- 建立临时表
select row_number() over(order by employeeId) as rowNumber, * into ##tmp from AdventureWorks.HumanResources.Employee

-- 从临时表导出数据
EXEC master..xp_cmdshell ' BCP "select * from tempdb..##tmp " queryout C:\test.xls -c  -SCN110075 -Usa -Pchang' 

-- 删除临时表
drop table ##tmp

-- 删除C:\test.xls
EXEC master..xp_cmdshell 'del C:\test.xls '

---------------------- 这样写有错，还为找到原因 ----------------------
EXEC master..xp_cmdshell ' BCP "HumanResources.Employee " out C:\test.xls -c  -SCN110075 -Usa -Pchang' 

-- 错误信息
/*
output
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
An error occurred while processing the command line.
NULL
*/

---------------------- union 好像双引号与查询语句之间不能有空格 ----------------------
EXEC master..xp_cmdshell 'BCP " select
"''ForeCastType''" as ForeCastType, "''OrderNumber''" as OrderNumber,
"''HHPN''" as HHPN, "''Plant''" as Plant, "''Quantity''" as Quantity, "''DueDate''" as DueDate
union
select "''LSF''" as ForeCastType, "''FCST2006''" as OrderNumber, HHPN,  Plant,
convert(varchar(10),Quantity) as Quantity, convert(char(10), DueDate, 20) as DueDate 
from Converter.dbo.detail
where pid=1 order by plant, HHPN, DueDate "
queryout c:\output.xls -c -SCN110075 -Usa -Pchang'