如何获得三个字符的结果

Question

I need to get a value of column with three characters instead of one.

this is my request : select rank() over (order by 1,2,32 ) from dual

and these is the result :

I need to get 001 instead of 1

Thanks for your help

Answer 1

Use LPAD() :

SELECT LPAD( '1', 3, '0' ) FROM DUAL;

Outputs:

001

So wrapping it around your query:

SELECT LPAD( rank() over (order by 1,2,32 ), 3, '0' )
FROM   DUAL;

Answer 2

可能是最简单的解决方案：

select to_char(rank() over (order by 1,2,32 ),'fm000') from dual

Answer 3

IMO, You can use SUBSTR() like this:

SELECT SUBSTR('000' || CAST((RANK() OVER (ORDER BY 1,2,32)) AS VARCHAR(3)), -3, 3) 
FROM DUAL;

Not tested yet ;).

Answer 4

select lpad(rank() over (order by 1,2,32 ),3,0) from dual;

select substr('00' || rank() over (order by 1,2,32 ),1,3) from dual;