0. 进入环境

su - omm
gsql -r

1. 创建数据库

先来看看默认都些啥吧!

\l

– 回显:

                              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 |
 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
(4 rows)

新创建名为tpcc1的数据库

CREATE DATABASE tpcc1;

新创建名为tpcc2的数据库

CREATE DATABASE tpcc2;

\l

– 回显:

                              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 |
 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           +
 tpcc2     | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
(6 rows)

           |       |          |             |             | omm=CTc/omm
 tpcc1     | omm   | UTF8     | en_US.UTF-8 | en_US.UTF-8 |

2. 修改数据库属性

将tpcc1重命名为tpcc10

ALTER DATABASE tpcc1 RENAME TO tpcc10;

3. 分别使用\l和\l+两个元命令查看数据库信息

先用\l看看

\l

– 回显:

                              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 |
 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 |
(6 rows)

\l+带来更多信息(Size, Tablespace, Description)

\l+

– 回显:

                                                               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 co
nnection 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 databa
se
           |       |          |             |             | 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)

4. 在数据库tpcc2中创建customer表, 字段自定义

使用tpcc2数据库

\c tpcc2;

– 回显:

Non-SSL connection (SSL connection is recommended when requiring high-security)
You are now connected to database "tpcc2" as user "omm".

创建Table名为customer

CREATE TABLE customer
( customer_sk             integer,
  customer_id             char(5),
  customer_first_name              char(6),
  customer_last_name               char(8)
);

– 回显:

CREATE TABLE

再确认一下建立成功了!!

\d

– 回显:

                          List of relations
 Schema |   Name   | Type  | Owner |             Storage
--------+----------+-------+-------+----------------------------------
 public | customer | table | omm   | {orientation=row,compression=no}
(1 row)

5. 删除新创建的数据库

DROP DATABASE tpcc10;

离开当前数据库, 才能删除啊!!

\c omm
DROP DATABASE tpcc2;

– 回显:

DROP DATABASE

6. 退出

\q