1.创建用户并将某个数据库的属主修改为该用户
create user uhxl;
alter user uhxl with password 'uhxl';
alter user uhxl with CONNECTION LIMIT 20;
alter database hxl owner to uhxl; ##修改数据库属主
GRANT ALL PRIVILEGES ON DATABASE hxl TO uhxl; ##或是授权
2.进入数据库查看数据库下的表
psql -h localhost -U uhxl -d hxl
select * from pg_tables where schemaname = 'public';
3.修改表的owner
person目前属主是postgres,现在修改为uhxl
psql -h localhost -U postgres -d hxl
alter table person owner to uhxl;
4.查看表的字段
hxl=#\d 表名称
5.查看表的ddl
只能使用pg_dump,使用pg_dump我们可以把表还有索引的语句都dump出来,这里使用-s选项(schema only)和-t选项(tables)。
pg_dump -s -t person -d hxl|egrep -v "^--|^$"
6.清除数据并清除自增ID
--清除所有的记录（有外键关联的情况下）
truncate table tb_test cascade;
--清除所有的记录，并且索引号从0开始
truncate table tb_test restart identity cascade;
7.查看权限
登陆具体的数据库:
psql -h localhost -U uhxl -d hxl
select * from information_schema.table_privileges where grantee='uhxl';
select * from information_schema.usage_privileges where grantee='uhxl';
select * from information_schema.routine_privileges where grantee='uhxl';
8.登陆数据库授权
psql -h localhost -U hxl01 -d hxl
grant SELECT on table public.tb_hxl to uhxl;
9.查询某个表在那个库下面:
SELECT * FROM information_schema.tables WHERE table_name='tb_hxl';
10.查看用户拥有的角色
postgres=# \du uhxl
List of roles
Role name | Attributes | Member of
-----------+----------------+-----------
uhxl | 20 connections | {}
postgres=# \du postgres
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------+-----------
postgres | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
11.创建数据库指定字符集
create database db_zifuji encoding = 'utf8';
12.查看所有的库
postgres=# \l
postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +
| | | | | postgres=CTc/postgres
13.查看用户
postgres=# \du
goldengate | Superuser | {}
postgres | Superuser, Create role, Create DB, Replication, Bypass RLS | {}