Convert int value of sql in QString without using C++

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  Hi all. I've got bp_link table with 'avalue' column VARCHAR2 (200). If I can find a different version of p here:
  
  (a) 100%
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  So I try to replace some symbols and convert the value to a number using the following steps:
  
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  But it still does not, maybe I don't see anything else.
  
  When I just "select * from...". "it works:
  
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  But when I try "order by avalue" ends with error - ORA-01722: invalid number
  
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  order of dd.avalue
  
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  Hi guys
  
  am on 10g
  
  I have a Table with 7 fields (all numbers).
  
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  So no matter how the Table is large, that I must be able to do, what is the best way to do this? Example SQL? PL/SQL?
  
  Thank you.

  Using NVL?

  SQL> select nvl(null, '0') from dual;
  
  N
  -
  0
  
  1 row selected.
  

  NULL for all related functions:
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• How to convert the number to SQL?

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  I don't know why this happens?
  
  Now, I tried to select with to_char (COLUMN1), but when I have values like "' 0,15 ' in the base, I get in select ', 15' when I convert with to_char?"
  
  Anyone know a solution?
  
  Kind regards
  Simon
  
  Edited by: user3654758 the 30.09.2010 02:02

  with mytable as
  (select 12 n of all the double union)
  Select 12.1 in union double all the
  Select 12.12 in union double all the
  Select 12.123 in all the double union
  Select double 12.1234)
  Select case when trunc (n) = n then
  TO_CHAR (n, 'FM9999999999999999999')
  on the other
  TO_CHAR (n, 'FM9999999999999999999D9999999')
  end
  FROM MyTable;

  Edited by: hartmutm the 30.09.2010 02:21

  I changed it a bit, because you have a problem with the separator decimal escape in the previous code.

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  Hello world
  
  can tell me, if we can find the second maximum value for a column without using
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  Bye and thanks.

  Hello

  Please see this.

  SQL > select * from emp where sal<(select max(sal)="" from="">

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  ---------- ---------- --------- ---------- --------- ---------- ---------- ----------
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  EMPNO, ENAME, JOB HIREDATE DEPTNO COMM SAL MGR
  ---------- ---------- --------- ---------- --------- ---------- ---------- ----------
  7902 7566 3000 3 DECEMBER ANALYST FORD 81 20
  7934 MILLER COMMITTED JANUARY 7782 1300 23 82 10
  1-1-10

  14 selected lines.

  SQL > select max (sal) from emp where sal<(select max(sal)="" from="">

  MAX (SAL)
  ----------
  3000

  Concerning

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