openGauss每日一练第5天

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 musicdb1  WITH TABLESPACE = music_tbs;
CREATE DATABASE musicdb2  WITH TABLESPACE = music_tbs;
CREATE DATABASE musicdb3  WITH TABLESPACE = music_tbs;

--执行下面的SQL语句，创建用户user1：

 CREATE USER user1 IDENTIFIED BY 'kunpeng@1234';
 
--授予user1数据库系统的SYSADMIN权限：

ALTER USER user1 SYSADMIN;

2.使用数据库用户user1登录到数据库musicdb1，创建一个表t11，并插入一条数据：

omm=# \c musicdb1 user1
Password for user user1: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb1" as user "user1".
musicdb1=>  create table t11(col1 char(20));
CREATE TABLE
musicdb1=>  insert into t11 values('Hello openGauss! 11');
INSERT 0 1
musicdb1=> select * from t11;  
         col1         
----------------------
 Hello openGauss! 11 
(1 row)

3.使用数据库用户user1登录到数据库musicdb2，创建一个表t21，并插入一条数据：

musicdb1=> \c musicdb2 user1
Password for user user1: 
musicdb2=> Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb2" as user "user1".

musicdb2=> create table t21(col1 char(20));
CREATE TABLE
musicdb2=>  insert into t21 values('Hello openGauss! 22');
INSERT 0 1
musicdb2=> select * from t21;
         col1         
----------------------
 Hello openGauss! 22 
(1 row)

4.使用数据库用户user1登录到数据库musicdb3，创建一个表t31，并插入一条数据：

musicdb2=> \c musicdb3 user1
Password for user user1: 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "musicdb3" as user "user1".
musicdb3=>  create table t31(col1 char(20));
CREATE TABLE
musicdb3=>  insert into t31 values('Hello openGauss! 33');
INSERT 0 1
musicdb3=> select * from t31;
         col1         
----------------------
 Hello openGauss! 33 
(1 row)