>>> Is there anything I can do to reduce the time taken? > > < Simon correctly advised > > > Do it in your favourite programming language rather than SQL.
> Let me be even more clear : > Memory is cheap and most servers have plenty. > Processors are fast and most servers have multiple with many cores. > Select the entire table of columns you need into memory. > Write a little code. > No it won't scale very well into millions of rows but I could easily run > a test and I will bet many mnay many dollars that processing the sums in > memory is orders of magnitude faster than SQL. You shouldn't even need to read the entire table (or view) into memory: just read row-by-row, and for each field, keep a running total and the count of non-NULL values. From these you can calculate your total and both types of average. Graham _______________________________________________ sqlite-users mailing list firstname.lastname@example.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users