PostgreSQL怎么切换数据库

$ su - postgres

Last login: Wed Mar 1 13:16:48 CST 2017 on pts/1

-bash-4.2$ psql

psql (9.2.18)

Type "help" for help.

postgres=#

postgres=# \c zzj_db;

You are now connected to database "zzj_db" as user "postgres".

zzj_db=#

zzj_db=# \c - zzj_user;

Password for user zzj_user:

You are now connected to database "zzj_db" as user "zzj_user".

zzj_db=>