leaf_yxj wrote: > Thanks for your answers. I really appreciate it. Although I don't understand the whole things you guys > mentioned to me. I think maybe I should do it by myself. I need to do a test. If there is any good > guide/white paper, please give me a link for me to study. I think the documentation is quite good and comprehensive: http://www.postgresql.org/docs/current/static/xfunc-c.html If you look for samples, the contrib modules will serve. Yours, Laurenz Albe -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general