Thanks to everyone for their help. Using Nigel's suggestion, I was able to gather all the summary data in one query. Those nested if()'s are really useful!
FWIW, you can see the summary stats at http://rockets.phillipsoasis.com Just click on Hopi Rockets and scroll to the bottom of the page. My small contribution to science education! This list is great! Mark On Wednesday 14 December 2005 09:42 am, nigel wood wrote: > Mark Phillips wrote: > >Flights > >+-----------+----------+----------+ > > > >| flight_id | data1_id | data2_id | > > > >+-----------+----------+----------+ > > > >| 1 | 1 | 1 | > >| 2 | 1 | 3 | > >| 3 | 1 | 1 | > >| 4 | 2 | 2 | > >| 5 | 2 | 3 | > >| 6 | 1 | 1 | > >| 7 | 1 | 1 | > >| 8 | 4 | 4 | > >| 9 | 1 | 2 | > >| 10 | 1 | 2 | > >| 11 | 1 | 1 | > > > >+-----------+----------+----------+ > > > >The data1_id and data2_id are indexes for the data recorded for that > > flight. > > > >I want to summarize the data. One such summary is to count the number of > >different data1_id's and data2_id's. For example: > > > >Flight Result Summary > > index: 1 2 3 4 > >data1_id 8 2 0 1 > >data2_id 5 3 2 1 > > select > sum(if(data1_id =1,1, 0)) as data1_id_1, sum(if(data1_id =2, 1, > 0)) as data1_id_2, etc , etc > sum(if(data2_id =1,1, 0)) as data2_id_1, sum(if(data2_id =2, 1, > 0)) as data2_id_2 etc, etc > from flights > > add composite indexes if required for speed. > > Nigel -- Mark Phillips [EMAIL PROTECTED] 602 524-0376 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
