sqlserver函数编写
select REPLACE (NEWID() ,'-','') +  
	replace(replace(replace(CONVERT(varchar, getdate(), 120 ),'-',''),' ',''),':','')  +
	CHAR(ROUND(RAND() * 25 + 65,0))
生成一串 随机字符串
想应用于  
create table MedicalService
(
id varchar(50) primary key default REPLACE (NEWID() ,'-','') +  
	replace(replace(replace(CONVERT(varchar, getdate(), 120 ),'-',''),' ',''),':','')  +
	CHAR(ROUND(RAND() * 25 + 65,0))
  )
生成表格用 。但是太长了 如何封装成类似函数的东西  累死于 default getdate() 。。函数不支持 rand
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