tahiti: SELECT SYSDATE, LAST_DAY(SYSDATE) "Last", LAST_DAY(SYSDATE) - SYSDATE "Days Left" FROM DUAL; SYSDATE Last Days Left --------- --------- ---------- 30-MAY-01 31-MAY-01 1 --romas On 5/13/08, Rick Ricky <ricks12345@xxxxxxxxx> wrote: > > I need to rollup data by month. > > There are a couple ways to do this. > > > I have a date field. So I can rollup with a to_char(mydate,'YYYYMM') > this requires a where clause as followings > where to_char(mydate,'YYYYMM') = pSomeMonth; > > > This means I need a function based index to support this. We have alot of > data, so where possible, I want to avoid adding more indexes. Is there a way > to calculate what the last > day of the month is? > > > so I can use a between as follows > where myDate between to_date(01-MON-YYYY') and > to_date(LASTDAYOFMONTH-MON-YYYY') > > > Since the last day of the month can be > 28,29,30,31 >