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So first line selects employee last_name and hire_date, and also I created new column called Years Worked by getting the Date in number format (TO_CHAR) subtracting hire_date from the system date and dividing by 365 to find the value in year.
If the year has 366 days it does not really matter because we are using ROUND function and it cuts all decimals.
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To see the system date and time use the following functions : CURRENT_DATE :returns the current date in the session time zone, in a value in the Gregorian calendar of datatype DATESYSDATE : Returns the current date and time.
SYSTIMESTAMP : The SYSTIMESTAMP function returns the system date, including fractional seconds and time zone of the database. To see the current system date and time give the following query.
The use of the DATE datatype used by the package will be examined in the following section.
Oracle Date arithmetic The DATE datatype is used by Oracle to store all datetime information in which a precision greater than one second is not needed.
select to_char(to_date(’15-aug-1947’,’dd-mon-yyyy’),’Day’) from dual; TO_CHAR(--------Friday To see how many days have passed since 15-aug-1947 then give the following query select sysdate-to_date(’15-aug-1947’,’dd-mon-yyyy’) from dual; Now we want to see which date will occur after 45 days from now select sysdate 45 from dual; SYSDATE-------06-JUN-2003 To see which date will occur after 6 months from now, we can use ADD_MONTHS function Select ADD_MONTHS(SYSDATE,6) from dual; ADD_MONTHS----------22-OCT-2003 To see how many months have passed since a particular date, use the MONTHS_BETWEEN function.