openGauss每日一练第3天|创建数据库、修改数据库属性和删除数据库

学习

openGauss创建数据库、修改数据库属性和删除数据库

课后作业

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 
-----------+-------+----------+-------------+-------------+-------------------
 music2    | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 omm       | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 postgres  | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 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 | 
(7 rows)

omm=# \l+
                                                               List of databases
   Name    | Owner | Encoding |   Collate   |    Ctype    | Access privileges | Size  | Tablespace |                Description                 
-----------+-------+----------+-------------+-------------+-------------------+-------+------------+--------------------------------------------
 music2    | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |                   | 10 MB | pg_default | 
 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       |       |            | 
 template1 | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/omm           +| 10 MB | pg_default | unmodifiable empty database
           |       |          |             |             | 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 | 
(7 rows)

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=# 
tpcc2=# 
tpcc2=# CREATE TABLE customer
tpcc2-# (  c_customer_sk             integer,   
tpcc2(#   c_customer_id             char(5),    
tpcc2(#   c_first_name              char(6),    
tpcc2(#   c_last_name               char(8) 
tpcc2(# ) ;
CREATE TABLE

5.删除新创建的数据库

tpcc2=# drop database tpcc1; 
ERROR:  database "tpcc1" does not exist
tpcc2=# drop database tpcc10;
DROP DATABASE
tpcc2=# drop database tpcc2;
ERROR:  cannot drop the currently open database
tpcc2=# \c postgres 
Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "postgres" as user "omm".
postgres=# drop database tpcc2;
DROP DATABASE

6.退出gsql程序

postgres=# \q
omm@modb:~$