Hello, I'm having a surprising performance problem with the following simple 'highscore report' select studentid, (select max(score) from studentprofile prof where prof.studentid = students.studentid) from students; I have indexes on students(studentid) and studentprofile(studentid). Row counts: about 160 000 in each students and studentprofile. Postgres version: postgresql-8.1.8-1.fc5 postgresql-server-8.1.8-1.fc5 This is a dual-processor 3Ghz 64bit box with 2 GB mem. Running the query takes 99% CPU and 1% mem. I have the same data in MSSQL and there the query takes less than a minute. With postgres it seems to take several hours. Is there a way of making this faster? Marko
