我怎样才能显示ROW_NUMBER字母

Question

SELECT Row_number() 
     OVER (
      ORDER BY setsid) AS Set_No, 
     setsid, 
     testid 
FROM examsets 
WHERE testid = 4 

结果是： -

Set_No    
------------------- 
1      
2      
3     
4      
5      
6     
7 

我想要的结果： -

Set_No    
------------------- 
a      
b      
c     
d      
e      
f     
g 

我怎样才能做到这一点？

Answer 1

你可以使用它。它不会处理返回超过26行的情况。

char(96+row_number() over(order by setsid)) 

从AA到ZZ去给你676个不同的值。

select char(((T.N/26) % 26) + 65) + char((T.N % 26) + 65) as Set_No 
from (
    select row_number() over(order by setsid) - 1 as N 
    from YourTable 
    ) as T 

SQL Fiddle

Answer 2

SELECT 
     char(ascii(row_number() over (order by setsid))+48) as Set_No  
     setsid, 
     testid 
FROM 
     examsets 
WHERE 
     testid = 4