PostgreSQL을 시작하는 방법

PostgreSQL 설치

// Refresh the apt-get repository
$ sudo apt-get update
// Install PostgreSQL
$ sudo apt-get install postgresql postgresql-contrib

postgres --version

시작하기

 $ sudo -u postgres psql
   -- Run command "psql" as UNIX USER "postgres".
   -- Enter the CURRENT SUPERUSER password for sudo.
psql (14.2 (Ubuntu 14.2-1.pgdg21.10+1))
Type "help" for help

postgres=# help
You are using psql, the command-line interface to PostgreSQL.
Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

-- Display version
postgres=# SELECT version();
                                                           version                                                           
-----------------------------------------------------------------------------------------------------------------------------
 PostgreSQL 14.2 (Ubuntu 14.2-1.pgdg21.10+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 11.2.0-7ubuntu2) 11.2.0, 64-bit

press q to quit display

-- Quit
postgres=# \q

-- Login to server
$ sudo -u postgres psql
......

-- List all databases via \l (or \list), or \l+ for more details
postgres=# \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   
-----------+----------+----------+-------------+-------------+-----------------------
 testdb    | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =Tc/postgres         +
           |          |          |             |             | postgres=CTc/postgres+
           |          |          |             |             | python=CTc/postgres
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres

-- Create a new database called testdb
postgres=# CREATE DATABASE testdb;
CREATE DATABASE

-- Connect to testdb database via \c (or \connect)
-- Take note of the change of database name in the command prompt.
postgres=# \c testdb 
You are now connected to database "testdb" as user "postgres".

-- Display all tables (aka relations) via \dt or \dt+ for more details
testdb=# \dt
Did not find any relations.


testdb=# CREATE TABLE IF NOT EXISTS accounts (
    user_id serial PRIMARY KEY, -- AUTO_INCREMENT integer, as primary key
    username VARCHAR ( 50 ) UNIQUE NOT NULL,
    password VARCHAR ( 50 ) NOT NULL,
    email VARCHAR ( 255 ) UNIQUE NOT NULL,
    created_on TIMESTAMP NOT NULL,
        last_login TIMESTAMP 
);

-- Display all tables in the current database, via \dt or \dt+ for more details
testdb=# \dt+
                                     List of relations
 Schema |   Name   | Type  |  Owner   | Persistence | Access method |  Size   | Description 
--------+----------+-------+----------+-------------+---------------+---------+-------------
 public | accounts | table | postgres | permanent   | heap          | 0 bytes | 


-- Quit
testdb=# \q

       - \l: List all database (or \list).
       - \d: Display all tables, indexes, views, and sequences.
       - \dt: Display all tables.
       - \dv: Display all views.
       - \di: Display all indexes.
       - \ds: Display all sequences.
       - \dS: Display all system tables.
       - \dT: Display all types.
       - \du: Display all users.