创建用户和库
create database ncyj;
create schema whepc;
create user whepc with password 'whepc';
grant all privileges on schema whepc to whepc;
set search_path to whepc,public;
create schema whepcdev;
create user whepcdev with password 'whepcdev';
grant all privileges on schema whepcdev to whepcdev;
set search_path to whepcdev,public;
create schema emergencydev;
create user emergencydev with password 'emergencydev';
grant all privileges on schema emergencydev to emergencydev;
set search_path to emergencydev,public;
1、查看用户
postgres=# \du
2、创建普通用户
postgres=# create user test encrypted password 'test';
3、创建超级用户
postgres=# create user test2 superuser;
4、创建一个普通用户，并且赋予相关权限
postgres=# create user test createdb createrole inherit password 'test';
5、将超级用户修改为普通用户
postgres=# alter user test nosuperuser;
6、修改用户为超级用户
postgres=# alter user test superuser;
7、修改用户密码
postgres=# alter user test2 password 'test';
8、修改用户名
postgres=# alter user test2 rename to test3;
NOTICE: MD5 password cleared because of role rename
9、锁定/解锁用户,不允许/允许其登录
postgres=# alter user test nologin;
postgres=# alter user test login;
10、设置用户的连接数,其中0表示不允许登录,-1表示无限制
postgres=# alter user test connection limit 10;
11、创建extension
注意：默认只有superuser可以创建，如果要在具体某一个数据库下建extension，需要先赋予superuser权限，建完以后再设 置为非superuser；
test=# create extension tablefunc;
删除extension：drop extension tablefunc;
查看extension：\dx
select * from pg_roles;
select * from pg_user;
show search_path;
设置的2种方法
SET search_path TO itsm;
ALTER database "数据库" SET search_path TO "模式";
知识点search_path 阅读：
https://blog.csdn.net/pg_hgdb/article/details/79410963
https://blog.51cto.com/2012ivan/2500177
https://www.csdn.net/tags/MtTaEg5sNjMwNjEzLWJsb2cO0O0O.html
https://www.cnblogs.com/ShaYeBlog/p/5795940.html
https://blog.csdn.net/qq1212qqpp/article/details/86064615
