>From this discussion, I'm assuming that there is no support for a "cumulative total index", is this correct? In other words, I'm looking for an index which lets me query a cumulative sum of a column in constant time, and which lets me find a row which has for instance the smallest cumulative sum above a certain value in constant time as well.
I'm in the process of implementing B-trees in procedural SQL so that I can do this efficiently, but I wanted to make sure I wasn't duplicating anyone's effort. Frederik On Fri, May 27, 2005 at 03:07:24PM -0400, [EMAIL PROTECTED] wrote: > Just in case you did not follow this suggestion, if you are using 4.0.x this > is > very simple. I was looking for this: > > set @total:=0; > select f1,f2,...,@total:[EMAIL PROTECTED] as Total from table where ...; > > is pretty simple. > > On Wed, 25 May 2005, Dan Bolser wrote: > > > On Wed, 25 May 2005, Russell Horn wrote: > > > > >I have a pretty simple table with a list of payments, not much more > > >than: > > > > > >paymentID | amount | paymentDate > > >1 | 123 | 2005-01-10 > > >2 | 77 | 2005-01-13 > > >3 | 45 | 2005-02-16 > > >4 | 13 | 2005-02-17 > > > > > > > > >I can get totals per month using a query like: > > > > > >SELECT SUM(amount) , DATE_FORMAT( `paymentDate` , '%Y-%m' ) FROM > > >`payments` GROUP BY DATE_FORMAT( payments . date , '%Y-%m' ) > > > > > >That would give me: > > > > > >amount | paymentDate > > >200 | 2005-01 > > >58 | 2005-02 > > > > > >Is there any way to get a running cumulative total directly from mysql? > > >Something like: > > > > > >amount | paymentDate > > >200 | 2005-01 > > >258 | 2005-02 > > > > > > > http://dev.mysql.com/doc/mysql/en/variables.html > > > > > > :D > > > > > > > > > > >Thanks, > > > > > >Russell. > > > > > > > > > > > > > > > -- > > MySQL General Mailing List > > For list archives: http://lists.mysql.com/mysql > > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > > > > _____ > Douglas Denault > http://www.safeport.com > [EMAIL PROTECTED] > Voice: 301-469-8766 > Fax: 301-469-0601 > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > -- http://ofb.net/~frederik/ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
