I am new to node red.
I am storing into the Oracle db in this date format dd-mm-yy hh:mi:ss.ff PM but I am getting a payload using a select query in this format yyyy-mm-ddThh:mi:ss.000Z but while retrieving data from Oracle db I want to print this format dd-mm-yyyy hh:mm:ss in my payload, how to write select query so that I can print the same date format,whatever stored in Oracle db
When you fetch a date value, it is stringified according to the NLS settings of your client. Looking at the same data with two different clients, you might see two different representations... of the same date.
If you want to choose the display format of a date, use Oracle function TO_CHAR in your query. It accepts a date and a format spec, and returns a string :
TO_CHAR(my_date_column, 'dd-mm-yyyy hh24:mi:ss')
It is also possible to change the default date format for the life time of your session, like :
ALTER SESSION SET NLS_DATE_FORMAT = 'dd-mm-yyyy hh24:mi:ss';
NB : if you are dealing with timestamps or timestamps with time zone, you need NLS_TIMESTAMP_FORMAT or NLS_TIMESTAMP_TZ_FORMAT.
Related
I want to get display of future and past dates in mm/dd/yyyy and dd/mm/yyyy format in Oracle SQL 18C using SQL functions, so I want the code for it. I tried code select sysdate from dual and I get the output 21-JAN-23, but I want output of future and past dates like 23/11/2033 and 16/12/2009 in mm/dd/yyyy and dd/mm/yyyy format.
Format date using TO_CHAR() function
SELECT
TO_CHAR( SYSDATE, 'FMMonth DD, YYYY' )
FROM
dual;
The output would be:
August 1, 2017
Creating a Future or Past Date
In Oracle, a DATE is a binary data type that ALWAYS consists of 7 bytes representing century, year-of-century, month, day, hour, minute and second and is NEVER stored in any particular human-readable format.
Therefore, if you want to get a DATE data type in a particular format then it is impossible as dates never have any format when they are stored.
If you want to get a date you can use:
A date literal:
SELECT DATE '2023-12-31' FROM DUAL;
or, the TO_DATE function:
SELECT TO_DATE('31/12/2023', 'MM/DD/YYYY') FROM DUAL;
Displaying Dates in a Client Application
However, if the problem is how to display a date in a particular format then you need to convert the binary DATE value to a string.
Most client applications (SQL*Plus, SQL Developer, TOAD, C#, Java, etc.) will implicitly convert a binary date to something that is human-readable when they display it and will have settings in the application that determine the default format that it applies to dates.
For SQL*Plus and SQL Developer, you can modify the NLS_DATE_FORMAT session parameter to change how that client application displays dates (note: this does not change how Oracle stores the dates internally, only how it is displayed by the client).
For example:
ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';
or:
ALTER SESSION SET NLS_DATE_FORMAT = 'MM/DD/YYYY';
And then the client application will display dates in that format when you use a SELECT statement.
For other client applications you will need to check the documentation for that application.
Explicitly Formatting Dates as Strings
If you want to display a DATE in a particular format independent of any settings in the client application then you will need to convert the date to a string.
Using TO_CHAR:
SELECT TO_CHAR(DATE '2023-12-31', 'MM/DD/YYYY') AS formatted_date FROM DUAL;
Or, if you are generating the date and formatting it (rather than taking an existing date and formatting it) then you could just use a string literal:
SELECT '31/12/2023' AS formatted_date FROM DUAL;
I'm trying to store date type data from Oracle FORMS with format mask as like DD-MM-YYYY but every time it store as like DD/MON/YY.
I already alter session with NLS_DATE_FORMAT, but result is as same as before.
Oracle internal date format that is written in the table is something you can't change in any way, but, in the same time, it is irrelevant. If you are dealing with DATE type column then you should know that it containes both the date and the time. How, where and when you will show it or use it is on you. Here is a sample of a few formats derived from that original Oracle DATE format...
WITH
t AS
(
Select SYSDATE "MY_DATE_COLUMN" From Dual
)
Select
MY_DATE_COLUMN "DATE_DEFAULT_FORMAT",
To_Char(MY_DATE_COLUMN, 'mm-dd-yyyy') "DATE_1",
To_Char(MY_DATE_COLUMN, 'yyyy/mm/dd') "DATE_2",
To_Char(MY_DATE_COLUMN, 'dd.mm.yyyy') "DATE_3",
To_Char(MY_DATE_COLUMN, 'dd.mm.yyyy hh24:mi:ss') "DATE_4"
From t
DATE_DEFAULT_FORMAT
DATE_1
DATE_2
DATE_3
DATE_4
22-OCT-22
10-22-2022
2022/10/22
22.10.2022
22.10.2022 10:59:44
You can find a lot more about the theme at https://www.oracletutorial.com/oracle-basics/oracle-date/
Regards...
In Oracle, a DATE is a binary data-type consisting of 7-bytes (representing century, year-of-century, month, day, hour, minute and second). It ALWAYS has those 7 components and it is NEVER stored in any particular human-readable format.
every time it store as like DD/MON/YY.
As already mentioned, no, it does not store a date like that; the database stores dates as 7 bytes.
What you are seeing is that the client application, that you are using to connect to the database, is receiving the 7-byte binary date value and is choosing to convert it to something that is more easily comprehensible to you, the user, and is defaulting to converting the date to a string with the format DD/MON/RR.
What you should be doing is changing how the dates are displayed by the client application by either:
Change the settings in the Toad (View > Toad Options > Data Grids > Data and set the Date Format option) and allow Toad to implicitly format the string; or
Use TO_CHAR to explicitly format the date (TO_CHAR(column_name, 'DD-MM-YYYY')).
I'm trying to store data as like DD-MM-YYYY.
If you want to store a date then STORE it as a date (which has no format) and format it when you DISPLAY it.
If you have a valid business case to store it with a format then you will need to store it as a string, rather than as a date, because you can format strings; however, this is generally considered bad practice and should be avoided.
Sadman, to add to what others have posted I suggest you do not write your applications with reliance on the NLS_DATE_FORMAT parameter but rather you screens and application should specify the expected DATE entry format and the code should use the TO_DATE function to store the data into the database. All application SQL should use the TO_CHAR function to format date output for display.
I am getting timestamp format as '01-APR-21 12.02.00.496677000 AM' from oracle, I want to change the format to load data into sql server column with datatype as datetime.
Current Input: '01-APR-21 12.02.00.496677000 AM'
Expected Output : 2021-04-01 12:02:00.496
I need to write the code in oracle to change timestamp format
Thanks
Neha
A TIMESTAMP is a binary data format consisting of 7-20 bytes (century, year-of-century, month, day, hour, minute, second, up to 6 bytes for fractional seconds and up to 7 bytes for time zone information); it does NOT have a format.
Why am I seeing the TIMESTAMP with a format?
You are seeing it with a format because whatever user interface you are using to access the database has decided that it is more useful to display the binary information as a formatted string rather than returning the raw byte values to you.
Typically, for SQL/Plus and SQL Developer, this is managed by the NLS_TIMESTAMP_FORMAT session parameter. Other user interfaces will have different mechanisms by which they manage the default format of dates and timestamps.
If you want to change the default for SQL/Plus (and SQl Developer) then you can use:
ALTER SESSION SET NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF9';
(Or whatever format you would like.)
How can I format the TIMESTAMP value?
If you then want to display the timestamp with a format (remember, a TIMESTAMP is not stored with any format) then you want to use TO_CHAR to convert it to a string where it can have a format.
If you want to format the TIMESTAMP as a YYYY-MM-DD HH24:MI:SS.FF3 string then use:
SELECT TO_CHAR( your_timestamp_column, 'YYYY-MM-DD HH24:MI:SS.FF3' )
FROM your_table
How can I convert a formatted string back to a TIMESTAMP?
From your comment:
I loaded the oracle data into a different SQL table where date format was varchar and data got loaded as '01-APR-21 12.02.00.496677000 AM'
Use TO_TIMESTAMP:
SELECT TO_TIMESTAMP( your_string_column, 'DD-MON-RR HH12:MI:SS.FF9 AM' )
FROM your_table
(Note: that this will convert your string to a binary TIMESTAMP and then whatever user interface you are using will use its rules on how to display it; and if the default format it is using is DD-MON-RR HH12:MI:SS.FF9 AM then the query above will look like it has done nothing; it has, the UI is just implicitly converting it back to a string to display it.)
I am exporting the reports data from DB to excel. I am having 2 DB(Local & QA) schemas and having same queries for reports. Here I am facing an issue with date formats. we are using Oracle 12c.
Date Format should be 'DD-MON-YY' like '01-AUG-18'
While exporting data to excel,
from local db, it exporting date like '12-09-18'.
from QA db, it exporting date like '12-AUG-18'.
Query is :
select trim(to_date('01-01-1970 00','DD-MM-YYYY hh24') + (createdtime)/1000/60/60/24)
from TBL_RESPONSESUMMARY;
Can any one guide me please.
Use TO_CHAR to explicitly specify the format model you want to use to output the date:
SELECT TO_CHAR(DATE '1970-01-01' + createdtime/1000/60/60/24, 'DD-MON-YYYY')
FROM TBL_RESPONSESUMMARY;
What your query does is:
to_date('01-01-1970 00','DD-MM-YYYY hh24') generates your epoch value as a DATE data type;
+ (createdtime)/1000/60/60/24 adds your milliseconds offset value to it (and the data type will remain as a DATE);
trim( string_value ) takes a string value and removes leading and trailing white space; however, your input value is a DATE not a string so Oracle must perform an implicit cast using TO_CHAR and it uses the NLS_DATE_FORMAT session parameter. On your local database this is probably DD-MM-RR but on the QA database it is DD-MON-RR so you get different values.
You could change the NLS_DATE_FORMAT so that it is consistent on both databases - however, it is better to use an explicit call to TO_CHAR so you are not relying on session variables and implicit casts.
You have different date format between two databases. Run this command on local database to change date format
ALTER SESSION SET NLS_DATE_FORMAT = 'DD-Mon-YY';
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.