创建PostgreSQL数据库

1、切换用户

su - postgres

2、登录数据库

psql

3、查看数据库超级用户, 这里的超级用户是pgsql，如下图：

postgres=> \du

4、切换为超级管理用户,成功后如下图：

postgres=> \c - pgsql          语法： \c - [user_name]

5、创建数据库和授权用户

create user demo_db with password 'demo_db12345';

create database demo_db with encoding='utf8' ;

grant all privileges on database demo_db to demo_db ;

6、连接建数据库后并改数据的归属用户

\connect demo_db;
create schema extensions;
create extension hstore schema extensions;
CREATE EXTENSION pg_trgm;
ALTER DATABASE demo_db SET search_path to "$user",public,extensions;
alter database demo_db owner to demo_db;
alter schema public owner to demo_db;
alter schema extensions owner to demo_db;
GRANT USAGE ON SCHEMA public to demo_db;

PostgreSQL给模糊搜索加索引 需要启用 CREATE EXTENSION pg_trgm;