Question

I am using this code to round down the decimal value to the next multiple of 25.
ie if value is 33.60 it should round to 33.50

create or replace
PROCEDURE         "TEST1" (PQUERY IN VARCHAR2) as
 prNspValue number(14,2) :='';
 p_percentage_Value number(4,2) :='';
  begin
  prNspValue:=33.60;
  dbms_output.put_line(prNspValue); 
  p_percentage_Value:=substr(prNspValue,instr(prNspValue,'.')+1,length(prNspValue));
  dbms_output.put_line(p_percentage_value); 
  p_percentage_Value:=p_percentage_Value-mod(p_percentage_Value,25);
  dbms_output.put_line(p_percentage_value);
  if(p_percentage_Value!=0)then
    prNspValue:=substr(prNspValue,1,instr(prNspValue,'.'))+p_percentage_Value/100;
  else 
  prNspValue:=substr(prNspValue,1,instr(prNspValue,'.'));
  end if;
 dbms_output.put_line(prNspValue);     
end;

but the problem is when the value is 33.60 it is taken as 33.6. so it is rounding it to 33.0.
How can i correct this code?

Answer 1

you can use the round function directly FLOOR(your_number*4)/4:

SQL> WITH my_data AS (
  2     SELECT 33.00 num FROM dual
  3     UNION ALL SELECT 33.10 FROM dual
  4     UNION ALL SELECT 33.20 FROM dual
  5     UNION ALL SELECT 33.30 FROM dual
  6     UNION ALL SELECT 33.40 FROM dual
  7     UNION ALL SELECT 33.50 FROM dual
  8     UNION ALL SELECT 33.60 FROM dual
  9     UNION ALL SELECT 33.70 FROM dual
 10     UNION ALL SELECT 33.80 FROM dual
 11     UNION ALL SELECT 33.90 FROM dual
 12  ) SELECT num,
 13           floor (num * 4) / 4 rounded
 14      FROM my_data;

       NUM    ROUNDED
---------- ----------
        33         33
      33,1         33
      33,2         33
      33,3      33,25
      33,4      33,25
      33,5       33,5
      33,6       33,5
      33,7       33,5
      33,8      33,75
      33,9      33,75

10 rows selected