Good advice ,tks both of you . For database books ,I found so many good books on Oracle,some on mysql,but db2 and postgres, so few. I have to read some books on Oracle for some advanced topics,although oracle and postgres are different ,I also get some useful info from it . I hope postgres will be as popular as linux one day , :) -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general