Number datatype

Hi
Assume I have 5 digits 2 numbers (as below). I notice that they do not occupy the same space.(First one consumes more storage.)
What is the reason for this?
99999
10000
Edited by: Pascal Nouma on Aug 15, 2009 6:42 PM

Justin Cave wrote:
Oracle, like all programs, stores numbers in binary. It takes more binary bits to store larger numbers than smaller numbers even if they have the same number of decimal digits.Actually, NUMBER datatype is not stored in binary - [Understanding Oracle NUMBER Datatype|https://metalink2.oracle.com/metalink/plsql/f?p=130:14:7587170171678335381::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,1007641.6,1,1,1,helvetica]. And yes, 99999 and 10000 do not occupy same number of bytes:
SQL> select dump(99999) from dual;
DUMP(99999)
Typ=2 Len=4: 195,10,100,100
SQL> select dump(10000) from dual;
DUMP(10000)
Typ=2 Len=2: 195,2Reason is 10000 is exact value of POWER(100,2). As soon as we, for example, add or subtract 1 space occupied will increase:
SQL> select dump(10001) from dual;
DUMP(10001)
Typ=2 Len=4: 195,2,1,2
SQL> select dump(9999) from dual;
DUMP(9999)
Typ=2 Len=3: 194,100,100
SQL> As you can see, number with more decimal digits can occupy less space.
SY.

Similar Messages

How to convert number datatype to raw datatype for use in data warehouse?

I am picking up the work of another grad student who assembled the initial data for a data warehouse, mapped out a dimensional dw and then created then initial fact and dimension tables. I am using oracle enterprise 11gR2. The student was new to oracle and used datatypes of NUMBER (without a length - defaulting to number(38) for dimension keys. The dw has 1 fact table and about 20 dimension tables at this point.
Before refining the dw further, I have to translate all these dimension tables and convert all columns of Number and Number(n) (where n=1-38) to raw datatype with a length. The goal is to compact the size of the dw database significantly. With only a few exceptions every number column is a dimension key or attribute.
The entire dw db is now sitting in a datapump dmp file. this has to be imported to the db instance and then somehow converted so all occurrences of a number datatype into raw datatypes. BTW, there are other datatypes present such as varchar2 and date.
I discovered that datapump cannot convert number to raw in an import or export, so the instance tables once loaded using impdp will be the starting point.
I found there is a utl_raw package delivered with oracle to facilitate using the raw datatype. This has a numbertoraw function. Never used it and am unsure how to incorporate this in the table conversions. I also hope to use OWB capabilities at some point but I have never used it and only know that it has a lot of analytical capabilities. As a preliminary step I have done partial imports and determined the max length of every number column so I can alter the present schema number columns tp be an apporpriate max length for each column in each table.
Right now I am not sure what the next step is. Any suggestions for the data conversion steps would be appreciated.

Hi there,
The post about "Convert Numbers" might help in your case. You might also interested in "Anydata cast" or transformations.
Thanks,

Using number datatype for date column

Hi
Is there a side effect for using "number" datatype for "date" column?
If so, what is the disadvantage?
Many thanks

Hi,
Ora_83 wrote:
Hi
Is there a side effect for using "number" datatype for "date" column?
If so, what is the disadvantage?Yes, there's a definite disadvantage.
Oracle provides date arithmetic and a number of functions for manipulating DATEs. None of them work with numbers.
For example,
SELECT    TRUNC (order_date, 'MONTH')     AS order_month
,       AVG (ship_date - order_date)     AS avg_delay
FROM       orders
GROUP BY TRUNC (order_date, 'MONTH')
;order_month involves a DATE function; it's pretty easy to find the month that conatins order_date.
avg_delay involves date arithmetic. It's extrememly easy to find how much the time passed between order_date and ship_date.
Depending on how you code dates as numbers, doing either one of the above may be just as easy, but doing the other will be very difficult. You'll waste a lot of effort converting the NUMBERs to real DATEs whenever you need to manipulate them.
Validation can be very difficult for NUMBERs, also.
Watch this forum. It's a rare day when there's not some question about how to get around a problem caused by storing dates in a NUMBER (or VARCHAR2) column. Don't add to that. Always use DATE columns for dates.

Understanding number datatype [A help for beginners]

I would like to share some practical aspects of Oracle Number datatype. Please visit following link.
http://mamohiuddin.blogspot.com/2007/03/practical-approach-to-understand-oracle.html
Thank you,
aijaz

My only comment would be, since this posting of yours is being made in March 2007, wouldn't it make sense to ensure that it's all correct for the latest version of Oracle (10.2) as 9iR2 is a little "old hat" now. I'm not saying that there is anything wrong with what you've demonstrated, but you only quote it as being compatible with 9iR2 and 10.2 has now been available for a good couple of years.

Problem with number datatype dimension in BIB

Hi,
I've got a problem. When I create dimension with number datatype and I assign it to my cube, I cannot use my cube with my BIB presentation object - such as Crosstab. Is this possible only with varchar dimensions?

It should work, but it would be helpful if you could specify more information, for example which errormessage you are seeing and where.

Preceeding Zeros in Number datatype

Hello all
Is there any way to store values with preceeding zeros in Oracle Number datatype (eg : person code: 00089034)
Thanks in advance

Yes it is possible, by storing it as a varchar2. However I would advice you to store the number as a number, and use a format mask for display:
SQL> select to_char(89034,'00000009') from dual;
TO_CHAR(8
00089034
1 rij is geselecteerd.Regards,
Rob.

Problem while modifying number datatype.

Hi All,
I have modified a column, which is of number datatype.
Initially it was number(8,2), now I have changed this to Number(10,2).
But, due to some change in requirement, I have to revese the changes. Now, I am trying to make it Number(8,2), but it is giving me the following error.
Error report:
SQL Error: ORA-01440: column to be modified must be empty to decrease precision or scale
01440. 00000 - "column to be modified must be empty to decrease precision or scale"
Is there a way to make it?
Please suggest..
I am using Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production.
Thnx in advance..
Bits..

You'd have to jump through some hoops to decrease the allowable number of digits in a column. You'd either have to re-create the table, i.e.
-- Save off the data in FOO
ALTER TABLE foo
RENAME TO foo_bkup;
CREATE TABLE foo (
-- New column definitions
INSERT /*+ APPEND */ INTO foo( list_of_columns )
SELECT list_of_columns
    FROM foo_bkupOr you could create a new column, copy the data, and rename the old column
ALTER TABLE foo
   ADD( temp_col_name number(8,2) );
UPDATE foo
   SET temp_col_name = old_col_name;
ALTER TABLE foo
DROP COLUMN old_col_name;
ALTER TABLE foo
RENAME COLUMN temp_col_name TO old_col_name;Justin

Domain of Number datatype

Hi all,
Recently i came across one of the most wierd situation across my whole Oracle experience of almost 3 Yrs. I created a table TESTAB (using Oracle 9i) as
NUMBER_F NUMBER
NUMBER_PS NUMBER(5,2)
VARCHAR_F VARCHAR2(10)
CHAR_F CHAR(10)
Then i inserted a row as
Insert into testab values ('0123.23', '099.34','Asim','Ahmed');
and it accepted the data for Number datatype in single qoutes and automatically parse it for Number datatype.!!!
SQL> select * from testab;
NUMBER_F NUMBER_PS VARCHAR_F CHAR_F
1 3.34
23 34.34
2.23 2.33 asim ahmed
123.23 99.34 Asim Ahmed
Can somebody explain is that the correct behaviour ! If it is, then i must say it is really shocking behavious for such a mature database like Oracle !
Asim Ahmed.

This feature is called 'implicit conversion'
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96624/03_types.htm#3435

Number datatype in designer import

Having Designer model number datatype columns or domains that do not have Col Decimal Places defined. Only maximum length is populated. Data Modeler designer import do not populate values to Precision nor Scale. Precision should be set.

Identifed as a code bug. According to former metalink. Tobe fixed in a future version.

How to update precision value in number datatype

hello all
i hava a database containing data in that there is a table which contan a number datatype
that is number(10)
the table contain large amount of data
now i need the precision value 2
that is number(10,2)
how i can update is
i try alter command the do this bu the error is there the table contain data
so please suggest the solution
thanks in advance

The number of columsn has nothing to do with it. The number of rows has nothing to do with it.
Here is a step-by-step example to address your problem. I will change DATA_OBJECT_ID from NUMBER to NUMBER(10,2) even though there are thousands of rows in the table, the column is "in the middle " of the table, and there are many rows with non-null values in that column.
07:02:43 > create table t3 as select * from all_objects;
Table created.
Elapsed: 00:00:06.22
07:04:08 > desc t3
Name                                      Null?    Type
OWNER                                     NOT NULL VARCHAR2(30)
OBJECT_NAME                               NOT NULL VARCHAR2(30)
SUBOBJECT_NAME                                     VARCHAR2(30)
OBJECT_ID                                 NOT NULL NUMBER
DATA_OBJECT_ID                                     NUMBER
OBJECT_TYPE                                        VARCHAR2(19)
CREATED                                   NOT NULL DATE
LAST_DDL_TIME                             NOT NULL DATE
TIMESTAMP                                          VARCHAR2(19)
STATUS                                             VARCHAR2(7)
TEMPORARY                                          VARCHAR2(1)
GENERATED                                          VARCHAR2(1)
SECONDARY                                          VARCHAR2(1)
NAMESPACE                                 NOT NULL NUMBER
EDITION_NAME                                       VARCHAR2(30)
07:04:12 > alter table t3 modify (data_object_id number(10));
alter table t3 modify (data_object_id number(10))
ERROR at line 1:
ORA-01440: column to be modified must be empty to decrease precision or scale
Elapsed: 00:00:00.98
07:08:05 > select count(*), min(data_object_id), max(data_object_id), count(distinct data_object_id), count(data_object_id)
07:09:06   2 from t3;
COUNT(*) MIN(DATA_OBJECT_ID) MAX(DATA_OBJECT_ID) COUNT(DISTINCTDATA_OBJECT_ID) COUNT(DATA_OBJECT_ID)
    184456                   0             1526320                         12225                 70092
1 row selected.
Elapsed: 00:00:00.11
07:09:41 > alter table t3 add (temp_data_object_id number(10,2));
Table altered.
Elapsed: 00:00:00.07
07:10:27 > update t3 set temp_data_object_id = data_object_id, data_object_id = null;
184456 rows updated.
Elapsed: 00:00:04.49Notice that our column of interest is now entirely null, so the restriction against reducing its scale or precision will not longer impact us.
07:11:00 >
07:11:17 > select count(*), min(data_object_id), max(data_object_id), count(distinct data_object_id), count(data_object_id) from t3;
COUNT(*) MIN(DATA_OBJECT_ID) MAX(DATA_OBJECT_ID) COUNT(DISTINCTDATA_OBJECT_ID) COUNT(DATA_OBJECT_ID)
    184456                                                                     0                     0
1 row selected.
Elapsed: 00:00:00.04
07:11:51 > alter table t3 modify (data_object_id number(10,2))
07:12:33 > /
Table altered.
Elapsed: 00:00:00.07
07:12:35 > update t3 set data_object_id=temp_data_object_id;
184456 rows updated.
Elapsed: 00:00:04.01
07:14:40 > select count(*), min(data_object_id), max(data_object_id), count(distinct data_object_id), count(data_object_id) from t3;
COUNT(*) MIN(DATA_OBJECT_ID) MAX(DATA_OBJECT_ID) COUNT(DISTINCTDATA_OBJECT_ID) COUNT(DATA_OBJECT_ID)
    184456                   0             1526320                         12225                 70092
1 row selected.
Elapsed: 00:00:00.09
07:14:49 > alter table t3 drop column temp_data_object_id;
Table altered.
Elapsed: 00:00:02.40
07:15:11 > desc t3
Name                                                              Null?    Type
OWNER                                                             NOT NULL VARCHAR2(30)
OBJECT_NAME                                                       NOT NULL VARCHAR2(30)
SUBOBJECT_NAME                                                             VARCHAR2(30)
OBJECT_ID                                                         NOT NULL NUMBER
DATA_OBJECT_ID                                                             NUMBER(10,2)
OBJECT_TYPE                                                                VARCHAR2(19)
CREATED                                                           NOT NULL DATE
LAST_DDL_TIME                                                     NOT NULL DATE
TIMESTAMP                                                                  VARCHAR2(19)
STATUS                                                                     VARCHAR2(7)
TEMPORARY                                                                  VARCHAR2(1)
GENERATED                                                                  VARCHAR2(1)
SECONDARY                                                                  VARCHAR2(1)
NAMESPACE                                                         NOT NULL NUMBER
EDITION_NAME                                                               VARCHAR2(30)
07:15:15 >

How do i check number datatype with precision is 6

Hello,
If a variable is declared as number datatype with precision 6.
Foe testing purpose ,i want to check which value is having precision >6
because iam getting ORA-06502 error PL/SQL numeric or value error
what can be the reason

Hi Kamal,
In my case everyday a nightly job is executed to execute the stored procs
and stores the errors in error table,
The complete eror description is
error in updating grant_vest_estm_amrtzn redistributing the overlapping expense ORA-06502:PL/SQL numeric or value error
Here is the query-- which is placed ina stored proc
o_Error_Text := 'Error in updating GRANT_VEST_ESTM_AMRTZN redistributing the overlapping expense ' ;
EXECUTE IMMEDIATE 'UPDATE GRANT_VEST_ESTM_AMRTZN
SET GRN_ESTM_TRNCHE_EXPS_Y = :1,
GRN_AMRTN_ORIGL_TRNCHE_EXPS_Y = :2,
GRN_VEST_ADJST_OPT_Q = :3
WHERE ORG_GRP_I = :4
AND GRN_N = :5
AND GRN_VEST_D = :6'
USING V_GRN_ESTM_TRNCHE_EXPS_Y(I), V_GRN_AMRTN_ORIG_TRNC_EXP_Y(I), V_GRN_VEST_NEW_ADJST_OPT_Q(I),
I_ORG_GRP_I, NEW_GRN(I), V_GRN_VEST_D(I);
V_GRN_ESTM_TRNCHE_EXPS_Y(I) are calculated based on some conditions
for example
V_GRN_ESTM_TRNCHE_EXPS_Y (I) := V_GRN_ESTM_TRNCHE_EXPS_Y(I) +
( (V_REM_GRN_VEST_ORIGL_OPT_Q(I) / V_GRN_VEST_OLD_ORIGL_OPT_Q(J)) * V_GRN_ESTM_EXPS_Y(J));
V_GRN_AMRTN_ORIG_TRNC_EXP_Y(I) := V_GRN_AMRTN_ORIG_TRNC_EXP_Y(I) +
( (V_REM_GRN_VEST_ORIGL_OPT_Q(I) / V_GRN_VEST_OLD_ORIGL_OPT_Q(J)) * V_GRN_ESTM_ORIGL_A(J));
V_GRN_VEST_NEW_ADJST_OPT_Q(I) := V_GRN_VEST_NEW_ADJST_OPT_Q(I) +
( (V_REM_GRN_VEST_ORIGL_OPT_Q(I) / V_GRN_VEST_OLD_ORIGL_OPT_Q(J)) * V_GRN_VEST_OLD_ADJST_OPT_Q(J));
V_REM_GRN_VEST_OLD_ORIGL_OPT_Q(J) := V_GRN_VEST_OLD_ORIGL_OPT_Q(J) - V_REM_GRN_VEST_ORIGL_OPT_Q(I);
V_REM_GRN_VEST_ORIGL_OPT_Q(I) := 0;
Looking forward for the response

When -ve scale in number datatype is used??????????

dear friends,
in the number datatype we specify precision and scale
limit of precision is 1-38 & scale is -64 to 127 if i m right
so i wll like 2 know when & how -ve scale value is used for data design
also plz tell me how 2 declare col if expected values 2 b entered in it r like 0.0000078 etc.
waiting for reply
thanking you
ganesh

Perhaps the following will help
SQL> create table test1 (
2 a number(5,0),
3 b number(5,1),
4 c number(5,2),
5 d number(5,-1),
6 e number(5,-2)
7 );
Table created.
SQL> insert into test1 values (1.234, 1.234, 1.234, 1.234, 1.234);
1 row created.
SQL> insert into test1 values (12.34, 12.34, 12.34, 12.34, 12.34);
1 row created.
SQL> insert into test1 values (123.4, 123.4, 123.4, 123.4, 123.4);
1 row created.
SQL> insert into test1 values (.1234, .1234, .1234, .1234, .1234);
1 row created.
SQL> insert into test1 values (.01234, .01234, .01234, .01234, .01234);
1 row created.
SQL> select * from test1
2 ;
         A          B          C          D          E
         1        1.2       1.23          0          0
        12       12.3      12.34         10          0
       123      123.4      123.4        120        100
         0         .1        .12          0          0
         0          0        .01          0          0
SQL>

Wht is max lenght of number datatype

Hi all,
Can any one tell me wht is the max lenght of number datatype in oracle
9i and 10g
Regards,

William, this is amazing! Is is a bug?
SQL> CREATE TABLE TEST3
2 AS SELECT 1E45 BGN FROM DUAL
3 /
Table created.
SQL> SET NUMW 50
SQL> INSERT INTO TEST3 VALUES(1E39);
1 row created.
SQL> INSERT INTO TEST3 VALUES(1E50); <--"How it is taken the value more than the precision..."
1 row created.
SQL> INSERT INTO TEST3 VALUES(1E48);
1 row created.
SQL> SELECT * FROM TEST3;
                                               BGN
    1000000000000000000000000000000000000000000000
          1000000000000000000000000000000000000000
1.00000000000000000000000000000000000000000000E+50
1000000000000000000000000000000000000000000000000
SQL> SELECT DATA_PRECISION, DATA_SCALE FROM USER_TAB_COLS
2 WHERE TABLE_NAME='TEST3'
3 AND   COLUMN_NAME='BGN';
                                    DATA_PRECISION
                                        DATA_SCALE
"Why these values are not shown ??"

How to format a number datatype

I had a report which uses a text field. In that text field included is a placeholder column that represents a datatype of number as &<CP_CAPITAL_BALANCE>. When I run it displays as:
Capital Balance of 3423548.00 as of ...
It should be formated into 3,423,548.00
Thanks,
Warren

Hi,
you can choose your desired number format by setting the "Format Mask" property of you text field (e.g. NNNGNNNGNNNGNN0D00).
N = not mandatory digit
0 = mandatory digit (in this way you always have two decimal digits)
G = group separator
D = decimal separator
Hope this helps you
Bye
Raffy

Largest number of digits for NUMBER datatype?

What is the largest length of a NUMBER that Oracle will "support"?
The documentation says the following:
     Datatype Limits indicates:
         "Can be represented to full 38-digit precision"
     NUMBER Data Types indicates:
          "Oracle guarantees the portability of numbers with precision of up to 20 base-100 digits, which is equivalent to 39 or 40 decimal digits depending on the position of the decimal point."
I realize if I define a column as simply NUMBER, I can insert numbers with a size up to 126 digits. However, Oracle seems to only maintain the first 40 digits IN MOST cases. The most number of digits it seems to allow is 40 before it starts to replace with 0's.
With numbers that have more than 40 digits, Oracle will sometimes replace any numbers after the 38th digit with a 0 and other times will replace with 0 after the 39th or 40th digit.
Therefore, what is the most number of digits we can have confidence in Oracle storing safely?
This was the code I used for testing this process.
create table max_num (num number);
declare
l_x number;
begin
for x in 1..200
loop
    l_x := x;
    insert into max_num values (rpad(1, x, 1));
end loop;
exception
when others then
    dbms_output.put_line('STOP: '||l_x);
    dbms_output.put_line(sqlerrm);
end;
select num, length(replace(num, 0)) from max_num;

Hi,
user109389 wrote:
What is the largest length of a NUMBER that Oracle will "support"?
The documentation says the following:
     Datatype Limits indicates:
         "Can be represented to full 38-digit precision"
     NUMBER Data Types indicates:
          "Oracle guarantees the portability of numbers with precision of up to 20 base-100 digits, which is equivalent to 39 or 40 decimal digits depending on the position of the decimal point."
I realize if I define a column as simply NUMBER, I can insert numbers with a size up to 126 digits. However, Oracle seems to only maintain the first 40 digits IN MOST cases. The most number of digits it seems to allow is 40 before it starts to replace with 0's.
With numbers that have more than 40 digits, Oracle will sometimes replace any numbers after the 38th digit with a 0 and other times will replace with 0 after the 39th or 40th digit.
Therefore, what is the most number of digits we can have confidence in Oracle storing safely?...
If the documentation says 38, then I'll say 38, too.
If you put in a number greater than or equal to 1E39, then Oracle may round it to 38 significant digits; that is, the last digits you entered may get turned to 0's, or rounded up.

Number datatype

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