openGauss每日一练第4天 | 学习心得体会

课后作业

1.创建用户

user1、user2、user3，授予user1、user2、user3数据库系统的SYSADMIN权限

1.1 测试环境准备：

su - omm
gsql -r
--进入数据库omm，创建表空间、测试数据库
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;

CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE DATABASE musicdb2  WITH TABLESPACE = music_tbs;

创建用户 user1，user2，user3，

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;

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：

表名分别为： products1、 products2、 products3

向表中插入数据：

\c musicdb2 user1
create table products11(product_id integer,product_name char(20),category char(30));
musicdb2=> insert into products1 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products1 values(1601,'lamaze','toys');  
INSERT 0 1
musicdb2=> insert into products1 values(1700,'wait interface','Books');
INSERT 0 1
musicdb2=> insert into products1 values(1666,'harry potter','toys');
INSERT 0 1
musicdb2=> select * from products1;
 product_id |     product_name     |            category            
------------+----------------------+--------------------------------
       1502 | olympus camera       | electrncs                     
       1601 | lamaze               | toys                          
       1700 | wait interface       | Books                         
       1666 | harry potter         | toys                          
(4 rows)

musicdb2=> \dt 
                           List of relations
 Schema |   Name    | Type  | Owner |             Storage              
--------+-----------+-------+-------+----------------------------------
 public | products1 | table | user1 | {orientation=row,compression=no}

-- 用user2 用户连接数据库musicdb2,创建products2表
musicdb2=> \c musicdb2 user2
Password for user user2: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user2".

musicdb2=> create table products2 as select * from products1;
INSERT 0 4

-- 用user3 用户连接数据库musicdb2,创建products3表
musicdb2=> \c musicdb2 user3
Password for user user3: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user3".
musicdb2=> \dt
                           List of relations
 Schema |   Name    | Type  | Owner |             Storage              
--------+-----------+-------+-------+----------------------------------
 public | products2  | table | user2 | {orientation=row,compression=no}
 public | products1 | table | user1 | {orientation=row,compression=no}

musicdb2=> create table products3 as select * from products1;
INSERT 0 4

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

musicdb2=> \dt
                           List of relations
 Schema |   Name    | Type  | Owner |             Storage              
--------+-----------+-------+-------+----------------------------------
 public | product2  | table | user2 | {orientation=row,compression=no}
 public | products1 | table | user1 | {orientation=row,compression=no}
 public | products3 | table | user3 | {orientation=row,compression=no}
(3 rows)