PostgreSQL psql Commnads - ghdrako/doc_snipets GitHub Wiki

\l           -- list database
\l+

\l+ <db_name>  -- show info about db ex size
select pg_database_size('<db_name>');
SELECT datname FROM pg_database;

\c <db_name> -- connect to db or if not exist create 

\conninfo  --  display information about current connection


CREATE DATABASE my_database WITH OWNER my_user;
CREATE DATABASE test_db WITH OWNER = test_usr ENCODING = 'UTF8' TABLESPACE = test_tbs LC_COLLATE = 'pl_PL.utf8' LC_CTYPE = 'pl_PL.utf8' CONNECTION LIMIT = -1;

createdb <db_name> -- Note that outside the PostgreSQL console you can also create a database with createdb

ALTER USER my_user CREATEDB; -- give a user the ability to create new databases

ALTER DATABASE name RENAME TO new_name;     # change db name - nie moze byc polaczen do bazy
ALTER DATABASE moja_baza OWNER TO postgres; # change db owner


select pg_size_pretty(pg_database_size('dvdrental'));  # specified db size
SELECT pg_database_size('dvdrental');

select current_database();

----------------
CREATE TABLESPACE test_tbs OWNER test_usr LOCATION '/pgqdata/cdl/PostgreSQL/9.2/data';
ALTER DATABASE test_baza SET TABLESPACE test_tbs;

CREATE SCHEMA test_schema;
\dn
\dn+
select current_schema();

\dn          - list schemas

\du          - list users

\d           - list object in curent database
\dt          - list tables in current db in public schema
\dt+         - get more information on tables
\dt <schema> - list tables in schematu
\dt <schema>.*
\dt *.*      - List tables from all schemas


\df <schema> - list stored procedures
\df+

\dv <schema> - list views

\di          - list indexes

select * from pg_indexes where tablename not like 'pg%';
select tablename,indexname,tablespace,indexdef  from pg_indexes where tablename = 'your_table_name';
SELECT * FROM pg_indexes WHERE  schemaname = 'public';

\dx+ pg_trgm - show info about extension

psql -V           - Check psql Client version

Select version(); - Check Postgres server version

\g           - seeing previous command

\timing

\e           - execute last command 

\x           - Show query output in the pretty-format - extended mode

\h CREATE DATABASE - show help for command

\?             - list postgres commands

\q           - quit console

\pset format csv - format outpu as csv
select ...      

\d <table>   - describe table
\d+ <table>  - Get detailed information on a table

\copy (SELECT * FROM __table_name__) TO 'file_path_and_name.csv' WITH CSV  - Copy table data to CSV file

SELECT * FROM pg_indexes WHERE tablename='<table>' AND schemaname='<schema>'; - Check indexes for a table 

ANALYZE [<table>] - Collects statistics about the contents of tables in pg_statistic system catalog

SELECT reltuples AS card FROM pg_class WHERE relname = '<table_name>'; - Approximate Table Row count / Table Cardinality


SELECT 
   table_name, 
   column_name, 
   data_type 
FROM 
   information_schema.columns
WHERE 
   table_schema = 'schema_name' 
   AND
   table_name = 'city';

service postgresql <stop|start|restart>

show all - Display configuration parameters
select * from pg_settings; - Display configuration parameters using sql

SELECT current_setting('max_connections'); - Show current setting from “max_connections”

show config_file; - Show Postgres config file location

\df+            - List functions
\ef myfunction  - Edit function

$$
CREATE FUNCTION add(integer, integer) RETURNS integer
 AS 'select $1 + $2;'
 LANGUAGE SQL
 IMMUTABLE
 RETURNS NULL ON NULL INPUT;
$$ 	

select add(5,9);

\connect opensim Opensim_Tester localhost;

\password username  - Set/Reset postgres user password

\du                     - Show all users
select * from pg_user;

psql -U testuser mytest - Login & enter postgres terminal

CREATE ROLE my_user WITH LOGIN PASSWORD 'my_password';

DROP ROLE [ IF EXISTS ] <user>;
# if some object block drop 
drop owned by <user> cascade;
# or
reassign owned by <user> to <other user>;

ALTER USER user_name WITH PASSWORD 'new_password';

# list users
SELECT usename AS role_name,
 CASE
  WHEN usesuper AND usecreatedb THEN
    CAST('superuser, create database' AS pg_catalog.text)
  WHEN usesuper THEN
    CAST('superuser' AS pg_catalog.text)
  WHEN usecreatedb THEN
    CAST('create database' AS pg_catalog.text)
  ELSE
    CAST('' AS pg_catalog.text)
 END role_attributes
FROM pg_catalog.pg_user
ORDER BY role_name desc;
	

 SELECT conrelid::regclass AS table_name,
       conname AS primary_key, 
       pg_get_constraintdef(oid) 
FROM   pg_constraint 
WHERE  contype = 'p' -- p - primary key u - unique f -foreign key 
AND    connamespace = '<schema_name>'::regnamespace   
ORDER  BY conrelid::regclass::text, contype DESC;


ALTER TABLE ONLY TEST
    ADD CONSTRAINT con_id PRIMARY KEY (con_id);
alter table TEST drop constraint IF exists con_id;

postgres=# SELECT format('GRANT SELECT ON TABLE %I TO someuser;', tablename) FROM pg_tables WHERE tablename~'^pgbench';
format 
-----------------------------------------------------
GRANT SELECT ON TABLE pgbench_accounts TO someuser;
GRANT SELECT ON TABLE pgbench_branches TO someuser;

postgres=# gexec
GRANT
GRANT