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Sysdate
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Returns the current date/time
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ADD_MONTHS
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Function to add a number of months to a date.
For example: add_months(SYSDATE,3) returns 3 months after sysdate.
This could be rounded to below is the resulting month has fewer days than the month this function is applied to.
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+,- (plus/minus)
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In Oracle you can add or substract a number of days from a date.
Example: sysdate+5 means systemdate/time plus 5 days
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GREATEST
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With the greatest function you can select the date/time that is the highest in a range of date/times.
Example: greatest (sysdate+4,sysdate,sysdate-5) = sysdate+4.
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LEAST
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With the least function you can select the earliest date/time in a range of date/times.
Example: least(sysdate+4,sysdate,sysdate-5) = sysdate-5.
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LAST_DAY
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Returns the last_day of a month based on the month the passed date is in.
Example: last_day(sysdate) returns the last day of this month.
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MONTHS_BETWEEN
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Returns the number of months between two dates. The number is not rounded.
Example: months_between(sysdate, to_date('01-01-2007','dd-mm-yyyy')) returns the number of months since jan 1, 2007.
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NEXT_DAY
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Date of next specified date following a date NEXT_DAY(, )
Options are SUN, MON, TUE, WED, THU, FRI, and SAT
SELECT NEXT_DAY(SYSDATE, 'FRI') FROM dual;
NOTE: This can be dependend on NLS_SETTINGS!
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ROUND
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Returns date rounded to the unit specified by the format model. If you omit the format, the date is rounded to the nearest day ROUND(, )
SELECT ROUND(TO_DATE('27-OCT-00'),'YEAR') NEW_YEAR
FROM dual;
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TRUNC
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Convert a date to the date without time (0:00h)
Example: TRUNC(sysdate) returns today without time.
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First day of the month.
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trunc(example_date,'MM')
Example: select trunc(TO_DATE('31-JAN-2007'),'MM') FROM dual;
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TO_CHAR(date,format_mask)
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Converts a date to a string using a format mask. Format masks are explained here
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