How to take max value for this senario

Question

Hi,
i have table xyz in which i have column display_code
for eg.
display_code in table like
1. '1100000-999'
2. '1100000-1000'
3. '1100000-1001'
now i have to take max value among 3 display code. my requirement when i take max it will give me '1100000-1001' or the next value
select max(display_code) from xyz table;
max(display_code)
'1100000-999'
Please help me to fetch max(display_code) = '1100000-1001'
thanks & regard
shyam~

Answer 1

SQL> with xyz as (
  2  select '1100000-999' display_code from dual union
  3  select '1100000-1000' from dual union
  4  select '1100000-1001' from dual
  5  )
  6  --
  7  -- actual query:
  8  --
  9  select display_code
10  from   xyz
11  where  to_number(substr(display_code, instr(display_code, '-')+1)) =  ( select max(to_number(substr(display_code, instr(display_code, '-')+1)))
12                                                                          from   xyz
13                                                                        );
DISPLAY_CODE
1100000-1001or
SQL> with xyz as (
  2  select '1100000-999' display_code from dual union
  3  select '1100000-1000' from dual union
  4  select '1100000-1001' from dual
  5  )
  6  --
  7  -- actual query
  8  --
  9  select display_code
10  from   xyz
11  where  to_number(replace(display_code, '-')) = ( select max(to_number(replace(display_code, '-')))
12                                                                          from   xyz
13                                                                        );
DISPLAY_CODE
1100000-1001Edited by: hoek on Sep 7, 2010 5:20 PM