Oracle Number Precision format

Question

Hi,
I have one doubt regarding Oracle Number format .
If the Number format is (4,2) ,Its accepting total 5 Bytes.
But if its 16,6 Its accepting 16 Bytes only . Its able to save numbers in 9,6 or 10,5 . Could you please me know Why it is so.
Regards
-

Answer 1

user8873073 wrote:
Sorry for the Confusion .
here are the details .
Say if the field type is 4,2 , It's accepting 12.34 ( total length 5)
If the field length is 16,6 , From the above scenario , I am expecting to enter a data of length 17 . But Its possible to enter value of length 16 only.
On trying to save 1234567890.123456 , its rounding off and displaying as 1234567890.12346 (5 missed) in table.Remember numbers are stored in an internal non-human readable format in Oracle. When you select a numeric
column in your client it has to convert it to a form you can read. The default format for your client is probably
rounding the result for you.
Try using a to_char around the numeric column like to_char(col, '9999999999.999999').
By the way, the '5' isn't missed in your example, it is simply rounding the .123456 bit to .12346 (rounding to 5 decimal places).
SQL> create table test_number (
  2  num number(16,6)
  3  );
Table created
SQL> insert into test_number
  2  values(1234567890.123456);
1 row inserted
SQL> select to_char(num,'9999999999.999999')
  2  from test_number;
TO_CHAR(NUM,'9999999999.999999
1234567890.123456
SQL> select to_char(num,'9999999999.99999')
  2  from test_number;
TO_CHAR(NUM,'9999999999.99999'
1234567890.12346Notice the difference in the last example.