RE: help with a monthly rollup

http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/functions 072.htm#i83733    

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Rick Ricky Sent: Tuesday, May 13, 2008 12:45 PM
To: oracle-l_at_freelists.org
Subject: help with a monthly rollup  

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

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