学习openGauss体系结构，使用多个用户访问同一个数据库

1.创建用户user1、user2、user3，授予user1、user2、user3数据库系统的SYSADMIN权限

清理环境

drop DATABASE IF EXISTS musicdb;  
drop DATABASE IF EXISTS musicdb1;  
drop DATABASE IF EXISTS musicdb2;  
drop DATABASE IF EXISTS musicdb3;  
drop tablespace IF EXISTS music\_tbs;  
drop user user1 cascade;  
drop user user2 cascade;  
drop user user3 cascade;  
CREATE TABLESPACE music\_tbs RELATIVE LOCATION 'tablespace/test\_ts1';  
CREATE DATABASE musicdb WITH TABLESPACE = music\_tbs;  
CREATE USER user1 IDENTIFIED BY 'kunpeng@1234';  
CREATE USER user2 IDENTIFIED BY 'kunpeng@1234';  
CREATE USER user3 IDENTIFIED BY 'kunpeng@1234';  
ALTER USER user1 SYSADMIN;  
ALTER USER user2 SYSADMIN;  
ALTER USER user3 SYSADMIN;  
\du

2.分别使用user1、user2、user3访问数据库musicdb2，创建各自的表，并插入数据。

表名和数据如下：

\c musicdb user1  

create table products1(product\_id INTEGER,product\_name Char(20),category Char(30));  

–注释需要指明表名

comment on column product\_id is '产品编号';  
comment on column products1.product\_id is '产品编号';  
comment on column products1.product\_name is '产品名';  
comment on column products1.category is '种类';  

insert into products1 values(1502,'olympus camera','electrncs');  
insert into products1 values(1601,'lamaze','toys');  
insert into products1 values(1700,'wait interface','Books');  
insert into products1 values(1666,'harry potter','toys');  
select \* from products1;  

–表名分别为： products1、 products2、 products3

\c musicdb user2  
create table products2(product\_id INTEGER,product\_name Char(20),category Char(30));  
insert into products2 values(1502,'olympus camera','electrncs');  
insert into products2 values(1601,'lamaze','toys');  
insert into products2 values(1700,'wait interface','Books');  
insert into products2 values(1666,'harry potter','toys');  
select \* from products2;  
\\c musicdb user3  
create table products3(product\_id INTEGER,product\_name Char(20),category Char(30));  
insert into products3 values(1502,'olympus camera','electrncs');  
insert into products3 values(1601,'lamaze','toys');  
insert into products3 values(1700,'wait interface','Books');  
insert into products3 values(1666,'harry potter','toys');  
select \* from products3;

3.使用user1、user2、user3用户中的任何一个，查看当前数据库musicdb2有哪些表

\dt  
musicdb=> \\dt  
List of relations  
Schema | Name | Type | Owner | Storage  
\--------+-----------+-------+-------+----------------------------------  
public | products1 | table | user1 | {orientation=row,compression=no}  
public | products2 | table | user2 | {orientation=row,compression=no}  
public | products3 | table | user3 | {orientation=row,compression=no}  
(3 rows)