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install posgresql 9.4

mkdir install_pg cd install_pg wget https://yum.postgresql.org/9.4/redhat/rhel-7-x86_64/pgdg-centos94-9.4-3.noarch.rpm sudo yum -y install http://yum.postgresql.org/9.4/redhat/rhel-7-x86_64/pgdg-centos94-9.4-3.noarch.rpm sudo yum -y groupinstall "PostgreSQL ...