命令格式切换数据库\c [database_name]切换用户\c - [user_name]先连上用户postgres、数据库postgres$ su - postgresLast login: Wed Mar 1 13:16:48 CST 2017 on pts/1-bash-4.2$ psqlpsql (9.2.18)Type help for help.postgres#切换数据库postgres# \c zzj_db;You are now connected to database zzj_db as user postgres.zzj_db#切换用户zzj_db# \c - zzj_user;Password for user zzj_user:You are now connected to database zzj_db as user zzj_user.zzj_db