SQL & PL/SQL :: Conversion Of CLOB To NCOLB
Sep 19, 2011
I want to convert Clob column datatype to NClob datatype. I tried to modify the column by using below method but got the mentioned error:
SQL> alter tab1 TABLE_NAME modify COLUMN_NAME nclob;
*
ERROR at line 1:
ORA-22859: invalid modification of columns
One of the other method with which I am familiar with is :
Quote:
First to Create a new column of the desired type and copy the current column data to the new type using the appropriate type constructor.
how to change the clob to Nclob datatype without using the temp column usage?
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Jan 25, 2013
We have a huge table in production, with LONG column. We are trying to change its datatype to CLOB. The table has 120 Million records and is of 270 GB in size.
We tried using the oracle expdp/impdp option to try the conversion in our perf environment. With 32 parallels, the export completed in 1.5 hrs. However, the import took 13 hrs.
I also tried the to_lob option using inserts, it went on for 20 hrs and I killed the process. Are there any ways to improve the performance of LONG to CLOB conversion on huge tables?
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Sep 24, 2008
Recently I came across this issue, which gives me an error as following.
ERROR:
ORA-22835: Buffer too small for CLOB to CHAR or BLOB to RAW conversion (actual: 4907, maximum: 4000)
Now I am running a very simple query against one of the View in our Database.
Query is:
Select Prj_Num,
PM_Comments
From ProjectDetails
Where Rel = ‘2008 10’
What I have discovered so far is one of the field in this view name “PM_Comments” has more than 4000 bytes of information in it, Which is not supported by tools I have available on my computer. I have Oracle SQL Plus, SQL plus Worksheet, Access and Excel installed on my machine. DBA related to this database are stating that the field is working fine and query is executing without error since they are using TOAD for SQL, which does have capabilities to read more than 4000 bytes.
What I have figured out so far is “PM_Comments” is a LOB and SQL plus is having trouble reading this information more than 4000 bytes in one field of information.Because of this diagnosis, I have tried using following queries but it did not useful either.
Select Prj_Num,
Substr (PM_Comments, 1, 4000)
From ProjectDetails
Where Rel = ‘2008 10’
Select Prj_Num,
DBMS_LOB.Substr(PM_Comments, 4000, 1)
From ProjectDetails
Where Rel = ‘2008 10’
But both of the above mentioned queries did not work either. and I get the same ORA-22835 Error.I do not need all of the information in “PM_Comments” field, I only need about first 1000 characters of it.
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Aug 17, 2012
I would need to convert the column datatype from BLOB to CLOB. currently in the table, the BLOB column has the data. the requirement is to convert this column from BLOB to CLOB datatype.
How to convert from BLOB datatype to CLOB datatype ?
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Apr 23, 2012
Some app (wich I can't touch) stores a value that I need to modify with a trigger or even with a view.
Original value: 7B751BF0 (2071272432 in decimal)
Stored value: 4028331387 (F01B757B in hexa)
To make things short, I'm getting 4028331387 and I need to convert it to 2071272432.
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Mar 12, 2013
I need to move one of my LMT tablespace to DMT, Can I do it , I know that the DMT's are depreciated since Oracle 9i but still need to know this.I am trying the below mentioned method to achieve the same.
SQL> exec DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_FROM_LOCAL('USERS');But I am facing the below mentioned error:
BEGIN DBMS_SPACE_ADMIN.TABLESPACE_MIGRATE_FROM_LOCAL('USERS'); END;
*
ERROR at line 1:
ORA-10616: Operation not allowed on this tablespace
ORA-06512: at "SYS.DBMS_SPACE_ADMIN", line 216
ORA-06512: at line 1
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Jan 12, 2012
I have an issue with date conversion. In my table dates are in this formate:
04-DEC-90 10:46:46
I need to convert it in To_date.
SQL> select to_date('04-DEC-90','dd-mon-yy') from dual;
TO_DATE('04-DEC-90','DD-MON-YY
------------------------------
04/12/2090
SQL>
But the year shoul be 1990 not 2090.
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Jan 4, 2013
I have a table datatype number (12,10) that I am reading out of. I am taking the value from this source table and inserting it into a destination table of datatype number (12,15).
I do not have the ability to alter the tables. How can i convert this number so i can insert. I am currently getting the error "ORA-01438: value larger than specified precision allowed for this column"
I am trying to use the to_number, but it not working. How can i format this number field so i can read it from source where i have number (12,10) and insert it successfully in a higher precision table of number(12,15)
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Mar 27, 2012
Again i getting confused with conversion function especially Explicit data type conversions. some cases oracle server automatically converts the data to the required type. This is called IMPLICIT CONVERSION. Explicit conversions are done by using the conversion functions.
Oracle Explicit Data Type Conversions are
1 TO_CHAR
2 TO_DATE
3 TO_NUMBER
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Jan 13, 2011
SELECT EMPNO ,ESAL,DEPTNO FROM EMP;
O/P
EMPNO ESAL DEPTNO
101 1000 10
I WANT O/P LIKE THIS
REQUIRED O/P
101
1000
10
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Jan 21, 2013
My requirement is to converts row to Column information and sum of column in Weight kg in below manner Data in columns are not of same nature they can keep on changing
Item Supplier Consumer Package DWP_NO DWP_ED Quality_code Pakaging Material WEIght kg
80026020 13984
90225217 21385 1 1 3 Not Applicable 22-paper .001
90218863 16578 1 1 1 Not Applicable 04-low density polyethylene (0.002+.002+.002)=.008
90218349 14507 1 1 1 Not Applicable 05-polypropylene,22-paper (.02+.05) =.07
40221108 21519 3,2,1 1 2 IKEA-CB-60 22-paper (.32+0.3+0.45)=1.07
find table structure
CREATE TABLE TEST_ROW_TO_COL
(
ITEM_CODE VARCHAR2(10 CHAR),
SUPPLIER_CODE VARCHAR2(10 CHAR),
"Consumer Package" NUMBER(2),
[code]...
ans insert statement of sample data
--SQL Statement which produced this data:
-- select * from Test_row_to_col where
item_code in ('80026020','90225217','90218863','90218349','40221108')
[code]...
I am using Oracle 11g
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Aug 29, 2013
I have one query in SQL server. I want to convert that query to Oracle. Well i am not that good with writing queries in Oracle. Following is the query in SQL server.
DECLARE @StartYear AS INT = 2010;
DECLARE @EndYear AS INT = 2014;
WITH
years
AS (SELECT YYYY = @StartYear
UNION ALL
SELECT yyyy + 1
FROM years
WHERE yyyy < @EndYear)
[code].......
Which Gives output in following format.
id_datedateYearMonthNumberMonthDayOfMonthDayOfWeekNumberDayOfWeekWorkingDay
201001011/1/201020101January16Friday1
201001021/2/201020101January27Saturday0
201001031/3/201020101January31Sunday0
201001041/4/201020101January42Monday1
201001051/5/201020101January53Tuesday1
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May 31, 2011
My company uses Remedy which stores date/time as an integer. I use the following formula to convert it to a readable date:
TO_CHAR(TO_DATE('01/01/1970', 'MM/DD/YYYY HH:MI:SS AM')+ ((createdate - 4*3600)/(60*60*24)),'MM/DD/YYYY HH:MI:SS AM') as Create_Date
I have to use the "4*3600" in order to get the date to show up correctly, but even then the date sometimes comes up wrong. If the date occurs in the morning, then the date shows up as the previous day. I am sure this is probably due to the offset I am adding in the above formula. If I don't add the 4 hour offset, then the date shows up 4 hours off.
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Aug 11, 2010
I have coluum value like 00000000399. i need to convert the float like i mentioned
00000000399 should be loaded as 3.99
00000001197 should be loaded as 11.97
00000000003 should be loaded as 0.03
wat option i try to change the value
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Nov 6, 2011
is there any licensed version tool available to convert objects from sql server to oracle especially procedures? I have tried with open source tools but that tool didn't convert properly.
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Feb 1, 2007
This is my query:
DELETE FROM GR_GUEST WHERE GUEST_NAME='Ambassador Jack Binns bring Patrick Clawson' AND RESERVATION_ID_FK=21635
It gives an ORA-01460 which is "unimplemented or unreasonable conversion requested"Removing the " AND RESERVATION..." gives the same error.
The problem is that GUEST_NAME is a VARCHAR (150) and RESERVATION_ID_FK is an INT so I don't see where any conversion is coming in.I had changed the name a little bit as it used to a (, ) and a : in the GUEST_NAME. I thought that might be causing the issue so I removed them with a REPLACE through an UPDATE query. However, the record still needs to be deleted.
It should be a simple query as it happens on this table all the time, so I don't know why this one is different.
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Mar 5, 2008
1075329297.572
This is unix time where 1075329297 is seconds 572 is milliseconds.
first il store this time in oracle database.when i am retrieving it i want this date into yyyy-dd-mm format. Is it possible to do it in oracle.(using convert function) or is there some other way?
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Feb 7, 2013
converting a string to date, my string looks like '01022013' '04022013', I tried to_date('01022013', 'dd-mm-yyyy') but couldn't work.
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May 14, 2011
I have 2 tables.The column in table A is number and Column in table B is a varchar2 datatype.I have to use the Column of table B as a filter to column of Table A.Below is the example.
create table A(Col1 number);
Inert into A values(1);
Inert into A values(2);
Inert into A values(3);
Inert into A values(4);
Create table B(Col1 Varchar2(100));
Insert into b value ('1,2,3');
Select * from A where col1 in (select col1 from b)
Error: Invalid Number
Is there a way to convert the varchar to number.The varchar field have multiple characters (numbers) seperated by commas.
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Dec 19, 2010
I have a problem i need to convert a blob column contains pic file to long row
i had many tries but no one succeeded
-----------------------------------
Source table | destination table
id number | id number
img blob | img long raw
------------------------------------
1 - INSERT INTO destination table SELECT id , img FROM Source table WHERE ROWNUM < 2
i have this error ORA-22835 Buffer too small for CLOB to CHAR or BLOB to RAW conversion (actual: 146092, maximum: 2000)
2 - INSERT INTO destination table SELECT id , dbms_lob.SUBSTR(img,0,2000) FROM Source table WHERE ROWNUM < 2
now errors but the lengh is 0 (i have no file )
What can i Do
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May 6, 2010
I am converting sybase to oracle database. during the migration, i have small doubt in triggers.
sybase source
create trigger testss_dt
on test
for delete
as
if @@rowcount = 0
return
insert into test
select id from deleted
return
I have converted oracle code here
create or replace trigger testss_dt
before delete on test
for each row
begin
insert into test
values(:old.test);
end;
But i have ignores @@rowcount concepts in oracle. what @@rowcount indicates in trigger?
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May 6, 2010
I want to change a table datatype from date to number where already existing data should get convert.any possibility of doing where i tried like this but no get changing. Even as Julian format is working a bit i want the data to come as GMT format
Scenarios where i tried are like this.
ALTER TABLE Contacts ADD ALERT_DATE1 NUMBER(20,0)
/
UPDATE Contacts SET ALERT_DATE1 = TO_NUMBER(ALERT_DATE)
/
ALTER TABLE Contacts DROP COLUMN ALERT_DATE
/
ALTER TABLE Contacts RENAME COLUMN ALERT_DATE1 TO ALERT_DATE
/
but second statement failing.
Julian fomat like
SELECT sysdate,
TO_CHAR(sysdate, 'J'),
TO_DATE(TO_CHAR(sysdate, 'J'),'J')
FROM dual;
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Sep 19, 2011
I have two cases
i . Convert Image to Hex String
ii . Convert the Hex Sting to Image
Case i is done, is Case ii is Possible in Oracle 11g Rel 2..?
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Jun 2, 2012
My application spools the data from database into file and file is fixed length. My application working fine when database has single byte characters. But I am getting fields postion misposition and length mismatch in spooled line when data base has Multi byte characters(ê).
I want to convert the multi byte characters into single byte while spooling the data( ê ==> e)
The below query has converted the multi byte to single byte character. But actual value is modified into lower case.
####################################################
select utl_raw.cast_to_varchar2((nlssort(c.Name,'nls_sort=binary_ai'))) sbyte, '|'
c.Name
from EMP c
viva! experiencias | Viva! Experiências
####################################################
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Mar 24, 2011
I have the following query
select a.EV_ACTOR_NAME, round((b.total_transfer/(24 * a.Max_Throughput)) * 100) AVG_ThroughPut,round(((b.total_transfer/a.Max_Throughput) * 100 )) MAX_Throughput from
(select distinct EV_ACTOR_NAME,((max(EV_TRANSFER_RATE) over ( partition by EV_ACTOR_NAME)) * 60 * 60) /1024 Max_Throughput from dprt_events where EV_ACTOR_NAME is not null ) a,
(select distinct EV_ACTOR_NAME, (sum(EV_TRANSFER_SIZE) over( partition by EV_ACTOR_NAME)/1024/1024/1024) total_transfer from dprt_events where EV_ED_ID in (40,105,112) and EV_END_TIME between (sysdate - 20) -12/24 and sysdate - 20) b
where a.EV_ACTOR_NAME = b.EV_ACTOR_NAME
This is the output i get :
EV_ACTOR_NAME AVG_THROUGHPUT MAX_THROUGHPUT
------------ ------------- --------------
actor2 1 33
actor3 0 0
actor1 2 53
How do I convert the above out put to following format.
EV_ACTOR_NAME value1 value2
-------------- -------------- --------------
actor2 AVG 1
actor2 MAX 33
actor3 AVG 0
actor3 MAX 0
actor1 AVG 2
actor1 MAX 55
I tried the following
WITH data AS
(select level a from dual connect by level <= 3)
select EE_ACTOR_NAME,decode(a, 1, AVG_ThroughPut, 2, MAX_Throughput) value from
(
[Code]...
but i always get the following error ORA-00904: "A": invalid identifier
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Apr 4, 2010
I am converting data from an old paradox table to a new oracle table, one of the problems im having is incompatibility with date and time formats:
some columns contain times in the format : "00:00:00" eg..... "15:00:00"
some columns have date in the format: "dd/mm/yyyy" eg....... "21/08/2000"
some columns have time and date eg.. "05/09/2000 15:49:39"
Currently I have the data held in tables within an access database, and in CSV format.
eg, I have dates like 03/04/2010 which i need to be 03-APR-10....
how I can get the following into Oracle date formats? there is over 1000 records so manual conversion is out of the question
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Jun 25, 2012
I recently became involved with databases, and i've came across with a little obstacle. I have strings that represent a date, they are very oddly formatted and need to store them as dates. the string format looks like this: 'Monday, May the 13th of 2001'
How can i effectively convert them to DATE type?
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Sep 18, 2009
When I try to convert numeric values � number(19) p.s 111111111111111111, the to_char function returns �1111111111111110000� because the to_char functions doesn�t support precision bigger than 15.
Is there any way to solve it?
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Oct 1, 2013
Can we read .pkb file or any conversion procedure
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Mar 8, 2010
I have been given some data in excel sheet to be uploaded in an Oracle Table. The dates are in Julian. The date in Julian in excel sheet is as :-'110048'.
In the excel file, I found that the cell was formatted as General and when I changed the formatting to Date I got the result as '19/04/2211'.
tell me a way to convert this Julian to mm/dd/yyyy format to be inserted into a table in Oracle.
Tried this :-
SQL> SELECT to_char(to_date(to_char(110048), 'J'),'DD/MM/YYYY') FROM dual;
TO_CHAR(TO
----------
18/04/4411
Not sure how to go about it.
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