postgres
# Install postgres
sudo apt-get update
sudo apt-get -y install postgresql
sudo su - postgres
psql
for connection info : \conninfo
for password : \password
for roles : \du
for database : \l
for relation : \d
for table : \dtpostgres
# Install postgres
sudo apt-get update
sudo apt-get -y install postgresql
sudo su - postgres
psql
for connection info : \conninfo
for password : \password
for roles : \du
for database : \l
for relation : \d
for table : \dtwhat is postgresql
PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development phase and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness.
This tutorial will give you a quick start with PostgreSQL and make you comfortable with PostgreSQL programming.
What is PostgreSQL?
PostgreSQL (pronounced as post-gress-Q-L) is an open source relational database management system (DBMS) developed by a worldwide team of volunteers. PostgreSQL is not controlled by any corporation or other private entity and the source code is available free of charge.postgres
Fun fact: "Postgres" has exactly as many characters as "Database"
Check for yourself!
Postgres --> 8 chars!
Database --> 8 chars!psql
In PostgreSQL the system determines which table is meant by following a search path, which is a list of schemas to look in.
The first matching table in the search path is taken to be the one wanted, otherwise, if there is no match a error is raised, even if matching table names exist in other schemas in the database.
To show the current search path you can use the following command:
SHOW search_path;
And to put the new schema in the path, you could use:
SET search_path TO myschema;
Or if you want multiple schemas:
SET search_path TO myschema, public;
Reference: https://www.postgresql.org/docs/current/static/ddl-schemas.htmlpsql commande \gset
=> SELECT 'hello' AS var1, 10 AS var2
-> \gset result_
=> \echo :result_var1 :result_var2
hello 10psql commande \gset
=> SELECT 'hello' AS var1, 10 AS var2
-> \gset
=> \echo :var1 :var2
hello 10Copyright © 2021 Codeinu
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