openGauss每日一练第4天

1.登录opengauss数据库并创建表空间music_tbs ，并在表空间中创建数据库musicdb2。

omm@modb:~$ gsql -r
gsql ((openGauss 3.0.0 build 02c14696) compiled at 2022-04-01 18:12:00 commit 0 last mr  )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

omm=# \db
      List of tablespaces
    Name    | Owner | Location 
------------+-------+----------
 pg_default | omm   | 
 pg_global  | omm   | 
(2 rows)

omm=# CREATE TABLESPACE music_tbs RELATIVE LOCATION 'tablespace/test_ts1';
CREATE TABLESPACE
omm=# create database musicdb2 with tablespace music_tbs;
CREATE DATABASE

2：创建3个用户user1，user2，user3，并赋予他们SYSADMIN权限。

omm=# create user user1 identified by 'Dongyunyun1!';    
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# create user user2 identified by 'dongyun@1';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
CREATE ROLE
omm=# create user user3 identified by 'User333@3';
NOTICE:  The encrypted password contains MD5 ciphertext, which is not secure.
omm=# CREATE ROLE
omm=# 
alter user user1 sysadmin;
ALTER ROLE
omm=# alter user user2 sysadmin;
ALTER ROLE
omm=# alter user user3 sysadmin;
ALTER ROLE

查看用户的权限我们用\du。我们看到这3个用户已经有了sysadmin的权限；

omm=# \du
 gaussdb   | Sysadmin                                                                            
                             | {}
 omm       | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Opera
toradmin, Policyadmin, UseFT | {}
 user1     | Sysadmin                                                                            
                             | {}
 user2     | Sysadmin                                                                            
                             | {}
 user3     | Sysadmin                                                                            
                             | {}

                                                              List of roles
 Role name |                                                    Attributes                       
                             | Member of 
-----------+-------------------------------------------------------------------------------------
-----------------------------+----------

3.分别以3个用户连接musicdb2.并创建表插入数据。

（1）利用user1连接数据库musicdb2.并创建表products1。插入部分数据。

omm=# \c musicdb2 user1;
Password for user user1: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user1".
musicdb2=> create table products1(product_id integer,product_name char(20),category char(30));
CREATE TABLE

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)

（2）利用user2连接数据库musicdb2.并创建表products2。插入部分数据。

musicdb2=> \c musicdb2 user2
Password for user user2: 
musicdb2=> 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(product_id integer,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> insert into products2 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products2 values(1601,'lamaze','toys');
INSERT 0 1
musicdb2=> insert into products2 values(1700,'wait interface','Books');
INSERT 0 1
musicdb2=> insert into products2 values(1666,'harry potter','toys');
INSERT 0 1
musicdb2=> select * from products2; 
 product_id |     product_name     |            category            
------------+----------------------+--------------------------------
       1502 | olympus camera       | electrncs                     
       1601 | lamaze               | toys                          
       1700 | wait interface       | Books                         
       1666 | harry potter         | toys                          
(4 rows)

（3）利用user3连接数据库musicdb2.并创建表products3。插入部分数据。

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=> create table products3(product_id integer,product_name char(20),category char(30));
CREATE TABLE
musicdb2=> 
musicdb2=> insert into products3 values(1502,'olympus camera','electrncs');
INSERT 0 1
musicdb2=> insert into products3 values(1601,'lamaze','toys');
INSERT 0 1
musicdb2=> insert into products3 values(1700,'wait interface','Books');
INSERT 0 1
musicdb2=> insert into products3 values(1666,'harry potter','toys');
musicdb2=> INSERT 0 1

musicdb2=> select * from products3;
       1601 | lamaze               | toys                          
       1700 | wait interface       | Books                         
       1666 | harry potter         | toys                          
(4 rows)

musicdb2=>  product_id |     product_name     |            category            
------------+----------------------+--------------------------------
       1502 | olympus camera       | electrncs 

4.使用user3用户，查看当前数据库musicdb2有哪些表

musicdb2=> \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)