PostgreSQL DDL Operations

Internal

• PostgreSQL Operations

Database Cluster

initdb

https://www.postgresql.org/docs/9.5/static/app-initdb.html

initdb will create a new database cluster.

Database

List Databases

psql -l [-h ... -U ... -d ...]

or

> \l

or

SELECT datname FROM pg_database;

Create a Database

createdb <dbname>

createdb -h localhost -U admin playground

or

CREATE DATABASE <dbname>;

Also see:

Database Name Case Sensitivity

Connect to a Database

psql <database-name>

Drop a Database

DROP DATABASE <dbname>;

This command will not work if there are users connected to the database:

ERROR:  database "..." is being accessed by other users
DETAIL:  There are 10 other sessions using the database.

The database can though be forcefully dropped as follows:

SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = '<db-name>';

This will report a number of backends and it will take a while until all will be terminated. You may need to run it several times to insure that all backends are gone. When all backends are gone, the database can be dropped.

Users

The following user operations are supported.

List Users

psql
\du

or

SELECT usename FROM pg_user;

Create User

Command line:

createuser <user_name>

or SQL client:

CREATE USER <user_name>;

Change Password

In psql, for the current user:

\password <user_name>

or

ALTER USER user_name WITH PASSWORD 'new_password';

Granting Privileges on a Database

GRANT ALL PRIVILEGES ON DATABASE <dbname> TO  <user>;

Tablespace

List Tablespaces

psql
\db

Tables

List Tables

psql
\dt

Create a Table

CREATE TABLE poc_library_component
(
  "id" integer NOT NULL,
  "name" text,
  "desc" text,
   CONSTRAINT poc_library_component_pk PRIMARY KEY (id)
)
WITH (
  OIDS=FALSE
);
ALTER TABLE poc_library_component OWNER TO is3_as;

Note: apparently, PostgreSQL does not like uppercases in column names.