PostgreSQL查看版本信息的操作_PostgreSQL_

 psql --version

 select version();

 show server_version;

 SHOW server_version_num;

 SELECT current_setting('server_version_num');

 SELECT current_setting(‘server_version_num');返回类型为text，如果需要可以转换为interger SELECT current_setting('server_version_num')::integer; 

 $ psql -U peimsmdata -h 127.0.0.1 peimsm could not change directory to "/root" Password for user peimsmdata: psql (9.2.23, server 9.6.3) WARNING: psql version 9.2, server version 9.6. Some psql features might not work. Type "help" for help. 

 $ psql --version could not change directory to "/root" psql (PostgreSQL) 9.2.23 # which -a psql /usr/bin/psql /usr/local/postgresql/bin/psql /bin/psql # mv /usr/bin/psql /usr/bin/psql.bak # ln -s /usr/local/postgresql/bin/psql /usr/bin/psql $ psql -U peimsmdata -h 127.0.0.1 peimsm could not change directory to "/root": Permission denied Password for user peimsmdata: psql (9.6.3) Type "help" for help.