CPP_CHEN的专栏

1) Install from rpm    a. download rpm from http://yum.postgresql.org/rpmchart.php  and then do "rpm -ivhpgdg-redhat92-9.2-4.noarch.rpm"    b. rpm -i http://yum.postgresql.org/9.2/redhat/rhel-5-x8

(1) Solution 1:pg_dump -d launchpad -t src_flr_sum2 | psql lsipsql -d lsi insert into src_flr_sum select * from src_flr_sum2;(2) Solution 2:http://blog.2ndquadrant.com/using_dblink_in_gree

(1)  The base principalanything OP NULL => NULLNULL OP anything => NULLNULL doesn't equal anything including NULL NULL = NULL => NULLNULL NULLNULL IS NULL => trueNULL IS NOT NULL => fal