openGauss每日一练第 3天 | 数据库创建

学习目标

学习openGauss创建数据库、修改数据库属性和删除数据库

1.分别创建名为tpcc1和tpcc2的数据库
omm=# create database tpcc1;
CREATE DATABASE
omm=# create database tpcc2;
CREATE DATABASE

2.将tpcc1数据库重命名为tpcc10
omm=# alter database tpcc1 rename to tpcc10;
ALTER DATABASE

3.分别使用\l和\l+两个元命令查看数据库信息

omm=# \l
                              List of databases
   Name    | Owner | Encoding |   Collate   |    Ctype    | Access privileges 
-----------+-------+----------+-------------+-------------+-------------------
 omm       | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 postgres  | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
(6 rows)

omm=#  template0 | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/omm           +
           |       |          |             |             | omm=CTc/omm
 template1 | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/omm           +
           |       |          |             |             | omm=CTc/omm
 tpcc10    | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 tpcc2     | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 

omm=# 
omm=# \l+
                                                               List of databases
   Name    | Owner | Encoding |   Collate   |    Ctype    | Access privileges | Size 
 | Tablespace |                Description                 
-----------+-------+----------+-------------+-------------+-------------------+------
-+------------+--------------------------------------------
 omm       | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 10 MB
 | pg_default | 
 postgres  | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 10 MB
 | pg_default | default administrative connection database
 template0 | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/omm           +| 10 MB
 | pg_default | default template for new databases
           |       |          |             |             | omm=CTc/omm       |      
 |            | 

 tpcc10    | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 10 MB
 | pg_default | 
 tpcc2     | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 10 MB
 | pg_default | 
(6 rows)

 template1 | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/omm           +| 10 MB
 | pg_default | unmodifiable empty database
           |       |          |             |             | omm=CTc/omm       |      
 |  

4.在数据库tpcc2中创建customer表，字段自定义

omm=# \c tpcc2
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database “tpcc2” as user “omm”.
tpcc2=# create table customer(id int,name char(34));
CREATE TABLE

5.删除新创建的数据库
omm=# drop database tpcc2;
DROP DATABASE
omm=# drop database tpcc10;
DROP DATABASE
6.退出gsql程序
omm=# \q
omm@modb:~$