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Each date represents the century, year, month, day, hours, minutes, and seconds.
The default date format is DD-MON-YY.
Using the SYSDATE function, you can display the current date and time.
You can use SYSDATE as you would use any other column name.
In order to view the time you will need to use the TO_CHAR function along with a
format mask which includes a time format element.
For example, you can display the current date by selecting SYSDATE from a table.
You usually select SYSDATE from a dummy table called DUAL.
All users can access the DUAL table.
It is owned by the SYS user.
It consists of one column known as DUMMY, and one row with the value X...
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