i have a table in apex oracle, i have a goal, constantly see the current date and time in the table after updating it. Someone can tell you how to do it.
For example:
Current date
10.10.2019 16:20:39
And after updating this table:
Current date
10.10.2019 16:21:39
You can use this syntax :
ALTER TABLE tab MODIFY current_date DEFAULT SYSDATE
provided your table already has current_date column of date type,
Use ALTER TABLE tab ADD current_date DATE DEFAULT SYSDATE if it's a non-existing column yet.
You can use triggers to achieve what you wanted. triggers are queries which fire on any CRUD actions.
So according to your scenario you need to create a trigger to update the current date and time column when updating your table row.
Hope this might help you
http://www.mysqltutorial.org/mysql-triggers.aspx
Related
How to fetch the last access date for a table in oracle using the query from Oracle DB?
I am using select TIMESTAMP from dba_tab_modifications query it's giving me last updates in table
but I need last execution of select query statement on a particular table
Thanks in Advance
Sai Kumar
Oracle does not keep this information by default. You need to enable the appropriate AUDIT rules. But I'd question what problem you think this will solve. Auditing every access to a table will be a lot of audit records.
Im currently using oracle 11g. I had extracted data from the schema once at a specific date to do some cleansing process. Suppose that now i would want to extract again but only with new/updated data from the last date i extracted, is there anyway i could get it? unfortunately these data does not have any column that store last edited date.
i was wondering if Oracle would automatically store that type of info that i could check? perhaps any transaction log?
Thanks,
A Physal
One way would be to enable flashback and then you can do:
SELECT * FROM table1
MINUS
SELECT * FROM table1 AS OF TIMESTAMP TIMESTAMP '2018-01-01 00:00:00.000';
To get all the rows changed since 2018-01-01.
I have a Existing column called CREATED DATE whose data type is "Date". I am trying to add a constraint to this CREATED DATE Column which will store "Record created time stamp". I have a following query in place but its working out. Any suggestions will be helpful.
ALTER TABLE CONTAINER_SCAN_LOG
MODIFY (CREATED_DATE DEFAULT (sysdate());
what is the error exactly ? what is the default date? anyway try to remove the parenthesis
ALTER TABLE ex_employee
MODIFY START_TIME DEFAULT (sysdate);
use timestamp instead of date
alter table t add (created_datetime timestamp default systimestamp)
or modify existing created_date to be of timestamp datatype and systimestamp default
Do Oracle materialized view records get timestamp automatically?
The date of the last refresh for a materialized view is held in ALL_MVIEWS.LAST_REFRESH_DATE (or USER_MVIEWS.LAST_REFRESH_DATE).
Oracle materialized view records do not get a timestamp automatically. However, a System Change Number (SCN) can be included with each record by adding "ORA_ROWSCN AS SCN" to the select statement. System Change Numbers (SCN) provide a row version number and are updated when the row is updated.
I have created a table in oracle XE, and I have a field with type date. I would like if possible when I insert a row, that it automatically fills that field with the current date from the system.
I am inserting the rows from the SQL prompt.
Thanks
Here is how, you need to format your table properly:
create table test (first number
, second timestamp default systimestamp
, third varchar2(12));
And your default value is always current system time formatted as timestamp.
change the field after creating the table
ALTER TABLE table MODIFY time_collumn TIMESTAMP DEFAULT CURRENT_TIMESTAMP;
Or you could also use a trigger:
CREATE OR REPLACE TRIGGER date_trigger
BEFORE INSERT
ON table_name
REFERENCING NEW AS NEW
FOR EACH ROW
BEGIN
SELECT sysdate INTO :NEW.column_name FROM dual;
END;
The below snippet might be helpful if we forget to add the constraint while creating the table:
ALTER TABLE TABLE_NAME
ADD CONSTRAINT CONSTRAINT_NAME
COLUMN_NAME DATA_TYPE DEFAULT CURRENT_DATE;