When importing columns of type "Timestamp" to an Oracle DB:
Import tbl:
02.09.13 00:00:00
After importing:
Oracle tbl:
02.09.13 08:23:44,000000000
In the Oracle tbl the type is also "Timestamp".
How can I remove the ",000000000"?
The TIMESTAMP datatype includes fractional seconds; there is no way to remove them within the database whilst maintaining the datatype. If you don't want fractional seconds then put the date into a DATE column.
It shouldn't matter whether the fractional seconds are stored or not. When selecting from the database into anything other than another date datatype you should format the date as required by the client displaying it. The normal method of doing this would be by using the function TO_CHAR(); for instance:
select to_char(column_name, 'dd.mm.yy hh24:mi:ss') from table_name
You can also do this at a session level by changing your NLS settings.
Unrelated to your question, but to address the comment on a comma being part of your timestamp; the default date format is determined by NLS_TERRITORY. A comma is a perfectly valid character to have here. Altering the NLS_TERRITORY, for example to France, it will appear as part of the NLS_DATE_FORMAT:
SQL> alter session set nls_territory = 'FRANCE';
Session altered.
SQL> select systimestamp from dual
2 ;
SYSTIMESTAMP
------------------------------------------------------------
18/09/13 13:09:54,418387 +01:00
Related
I have been trying deleting records from a table which are of the current date that is sysdate in oracle. You can refer the below image where I tried
Tables Structure and inserted data
Querying Records
As you could see in the first image the type of updated_date is date. When I make an insert the data gets inserted with sysdate but when I try to select/delete it doesnt work in the second image.
At first, I thought maybe due to change in time may have caused this but the type is date and even I have tried to format it to dd-mon-yy so that shouldnt be the case
DATE data type has time component, which is not displayed in your tool.
DATE
The DATE datatype stores point-in-time values (dates and times) in a table. The DATE datatype stores the year (including the century), the month, the day, the hours, the minutes, and the seconds (after midnight).
You need to truncate both SYSDATE and updated_date columns.
SELECT * FROM EMPL WHERE TRUNC(updated_date) = TRUNC(SYSDATE);
To check "real value" you should change the NLS_DATE_FORMAT:
alter session set nls_date_format = 'DD-MON-YYYY HH24:MI:SS';
SELECT * FROM EMPL;
We use Oracle 10.2.0.4.0 database, oracle form builder and report builder for creating forms and reports.
Now the problem is in our production database nls_date_format is dd-mon-rr format. When developer create form in developer suit they give dd-mm-rr format at form level and when data stored in table that date format is dd-mm-rr.
Now when developer run form or report within form builder it gives dd-mm-rr format.but when same form or report run from application server side it gives junk characters in month.date and year print same as date format only month display in junk characters.
Hope you all guide well.
There are two issues.
when data stored in table that date format is dd-mm-rr.
This is completely wrong. Oracle doesn't store the date in the format you see, what you see is for display. Oracle stores DATE in an internal proprietary format in 7 bytes with each byte representing different elements of the DATE.
Byte Description
---- -------------------------------------------------
1 Century value but before storing it add 100 to it
2 Year and 100 is added to it before storing
3 Month
4 Day of the month
5 Hours but add 1 before storing it
6 Minutes but add 1 before storing it
7 Seconds but add 1 before storing it
Do not depend on the locale_specific NLS_DATE_FORMAT. Always use:
TO_CHAR to display the date in your desired format
TO_DATE to explicitly convert the string into date.
Remember, TO_DATE is NLS dependent.
If you only have a date element, and if you do not care about the time element, then better use ANSI Date literal which follows a fixed format 'YYYY-MM-DD'.
only month display in junk characters
This is again because you are depending on the NLS_DATE_LANGUAGE. As I said, you should avoid depending on the locale-specific client settings. Explicitly mention the NLS_DATE_LANGUAGE or use ANSI Date literal if you are not concerned about the time element.
For example,
SQL> SELECT TO_CHAR(SYSDATE, 'DD-MON-RR') dt FROM DUAL;
DT
---------
26-OCT-15
SQL> alter session set nls_date_language='french';
Session altered.
SQL> SELECT TO_CHAR(SYSDATE, 'DD-MON-RR') dt FROM DUAL;
DT
-----------
26-OCT. -15
So, what happened above? for a person using FRENCH nls_date_language, the MONTH is showing junk value. Let's make it NLS independent by explicitly mentioning the nls_date_language.
SQL> SELECT TO_CHAR(SYSDATE, 'DD-MON-RR', 'nls_date_language=english') dt FROM DUAL;
DT
---------
26-OCT-15
Also, the NLS_LANG value might not be correctly set in the OS environmental variable. See Why are junk values/special characters/question marks displayed on my client?
I have created a table in Oracle in which I have KPI_START_DATE column which is a Date datatype, and KPI_START_TIME which is a TIMESTAMP datatype.
Now I want to modify this date dataype for
KPI_START_DATE to dd/mm/yyyy
and
KPI_START_TIME to HH:MI:SS.
So that user should always enter the date and time in this column in this proper format.
I tried below query but its was giving error:
Alter table KPI_DEFINITION MODIFY(to_char(KPI_START_DATE,'dd/mm/yyyy') )
DATE and TIMESTAMP columns do not have any inherent readable format. The values are stored in Oracle's own internal representation, which has no resemblance to a human-readable date or time. At the point to retrieve or display a value you can convert it to whatever format you want, with to_char().
Both DATE and TIMESTAMP have date and time components (to second precision with DATE, and with fractional seconds with TIMESTAMP; plus time zone information with the extended data types), and you should not try to store them separately as two columns. Have a single column and extract the information you need at any time; to get the information out of a single column but split into two fields you could do:
select to_char(KPI_START, 'dd/mm/yyyy') as KPI_START_DATE,
to_char(KPI_START, 'hh24:mi:ss') as KPI_START_TIME
but you'd generally want both together anyway:
select to_char(KPI_START, 'dd/mm/yyyy hh24:mi:ss')
Also notice the 'hh24' format model to get the 24-hour clock time; otherwise you wouldn't see any difference between 3 a.m. and 3 p.m.
You can store a value in either type of column with the time set to midnight, but it does still have a time component - it is just midnight. You can't store a value in either type of column with just a time component - it has to have a date too. You could make that a nominal date and just ignore it, but I've never seen a valid reason to do that - you're wasting storage in two columns, and making searching for and comparing values much harder. Oracle even provides a default date if you don't specify one (first day of current month). But the value always has both a date and a time part:
create table KPI_DEFINITION (KPI_START date);
insert into KPI_DEFINITION (KPI_START)
values (to_date('27/01/2015', 'DD/MM/YYYY'));
insert into KPI_DEFINITION (KPI_START)
values (to_date('12:41:57', 'HH24:MI:SS'));
select to_char(KPI_START, 'YYYY-MM-DD HH24:MI:SS') from KPI_DEFINITION;
TO_CHAR(KPI_START,'YYYY-MM-DDHH24:MI:SS')
-----------------------------------------
2015-01-27 00:00:00
2015-01-01 12:41:57
Your users should be inserting a single value with both date and time as one:
insert into KPI_DEFINITION (KPI_START)
values (to_date('27/01/2015 12:41:57', 'DD/MM/YYYY HH24:MI:SS'));
select to_char(KPI_START, 'YYYY-MM-DD HH24:MI:SS') from KPI_DEFINITION;
TO_CHAR(KPI_START,'YYYY-MM-DDHH24:MI:SS')
-----------------------------------------
2015-01-27 12:41:57
You can also use date or timestamp literals, and if using to_date() you should always specify the full format - don't rely on NLS settings as they may be different for other users.
You should understand difference between datatype and format. DATE is a datatype. TIMESTAMP is a datatype. None of them have formats, they're just numbers.
When converting character datatype to or from date datatype, format should be applied. It's an attribute of an actual conversion, nothing else.
Look at this:
SQL> create table tmp$date(d date);
Table created
SQL> insert into tmp$date values (DATE '2010-11-01');
1 row inserted
SQL> insert into tmp$date values (DATE '2014-12-28');
1 row inserted
SQL> select d, dump(d) from tmp$date;
D DUMP(D)
----------- ---------------------------------
01.11.2010 Typ=12 Len=7: 120,110,11,1,1,1,1
28.12.2014 Typ=12 Len=7: 120,114,12,28,1,1,1
There is no any 'format' here.
DISPLAYING and STORING are NOT the same when it comes to DATE.
When people say Oracle isn’t storing the date in the format they wanted, what is really happening is Oracle is not presenting the date in the character string format they expected or wanted.
When a data element of type DATE is selected, it must be converted from its internal, binary format, to a string of characters for human consumption. The conversion of data from one type to another is known as known a “conversion”, “type casting” or “coercion”. In Oracle the conversion between dates and character strings is controlled by the NLS_DATE_FORMAT model. The NLS_DATE_FORMAT can be set in any of several different locations, each with its own scope of influence.
I could go on with my leacture over DATE data type, but I am glad that someone has already got a good writeup over this. Please read this https://edstevensdba.wordpress.com/2011/04/07/nls_date_format/
I am using Oracle10g database in which a table contains a Column with Date DataType. I am using the following query to get the record:
select to_char(START_TIME, 'YYMMDD HH24:MI:SS') from table;
So from above query, the result will be of type VARCHAR. I have tried to_Date() method but resulted in displaying only DATE. Can i convert VARCHAR to DATETIME format? The result should be of type DATETIME. Please help me how to resolve this problem.
an Oracle date contains both date and time so you can consider it a datetime (there is no datatype of datetime in Oracle). how is DISPLAYS when you select it is entirely up to your client. the default display setting is controlled by the NLS_DATE_FORMAT parameter. If you're just using the date in your pl/sql block then just assign it into a date datatype and select into that variable without to_char and it will work just fine and contain whatever time component is present in your table.
to control the display, for example using nls_date_format:
SQL> select a from datetest;
A
---------
19-FEB-13
SQL> alter session set nls_date_format='YYMMDD HH24:MI:SS';
Session altered.
SQL> select a from datetest;
A
---------------
130219 07:59:38
but again, this is only for display.
Oracle's Date type fields contain date/time values, therefore converting it to Datetime does not make any sense (it's already datetime)
Read more about oracle date types here
Yeah the Date datatype will meet your needs but you will have to jump through some hoops every time to get the exact time out of it. Definitely use the Timestamp datatype.
I have an entity class which has a timestamp property.
If I save an entity instance in oracle, the corresponding timestamp column will be written into Chinese format(I am using oracle 10g with Chinese locale).
22-8月 -11 07.04.03.926000 下午 is saved
But I want 2011-08-22 19:04:03.926
How can change column definition or database locale setting?
A timestamp in Oracle is a point in time. As such, there is no format stored with the data. When you retrieve data from a timestamp column, it is displayed by default in the format specified by your NLS_TIMESTAMP_FORMAT or NLS_TIMESTAMP_TZ_FORMAT session variable.
You can always use a specific format with to_char:
SQL> SELECT to_char(systimestamp, 'yyyy-mm-dd hh24:mi:ss.ff3') my_ts FROM dual;
MY_TS
-----------------------------
2011-08-22 14:38:48.351
You could also set a new default for your session with:
SQL> ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT='yyyy-mm-dd hh24:mi:ss.ff3';
Session altered
SQL> select systimestamp from dual;
SYSTIMESTAMP
-------------------------------------------------
2011-08-22 14:42:23.776