In response to ????????? : > How can I do a moving avg by only using SQL? Which version do you have? Since 8.4 we have CTE aka windowing functions, a simple axample: test=*# select n, last_value(n) over mywin , avg(n) over mywin from generate_series(1,20) n window mywin as (partition by (n-1)/4 rows between unbounded preceding and unbounded following); n | last_value | avg ----+------------+--------------------- 1 | 4 | 2.5000000000000000 2 | 4 | 2.5000000000000000 3 | 4 | 2.5000000000000000 4 | 4 | 2.5000000000000000 5 | 8 | 6.5000000000000000 6 | 8 | 6.5000000000000000 7 | 8 | 6.5000000000000000 8 | 8 | 6.5000000000000000 9 | 12 | 10.5000000000000000 10 | 12 | 10.5000000000000000 11 | 12 | 10.5000000000000000 12 | 12 | 10.5000000000000000 13 | 16 | 14.5000000000000000 14 | 16 | 14.5000000000000000 15 | 16 | 14.5000000000000000 16 | 16 | 14.5000000000000000 17 | 20 | 18.5000000000000000 18 | 20 | 18.5000000000000000 19 | 20 | 18.5000000000000000 20 | 20 | 18.5000000000000000 (20 rows) Regards, Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
