postgresql if not exists - PostgreSQL CREATE DATABASE if not EXISTS - PostgreSQL SELECT exist

Documentation: 17: CREATE TABLE

IF NOT EXISTS #. Do not throw an error if a relation with the same name already exists. A notice is issued in this case. Note that there is no guarantee that 

Three Cases Against IF NOT EXISTS

IF NOT EXISTS suppresses errors and allows to "deploy" the change many times. However, this approach just hides the imperfection of the 

PostgreSQL EXISTS Operator

The NOT EXISTS operator returns true if the subquery returns no row or false if the subquery returns at least one row. In practice, you 

PostgreSQL Create Table IF NOT EXISTS

The IF NOT EXISTS clause will first check the existence of the targeted table. If the table already exists, then a notice will be issued instead of throwing an 

PostgreSQL INSERT IF NOT EXISTS

You can use the subquery to check the existence of a specific record in a table. For this purpose, use the NOT EXISTS option within the WHERE Clause.

PostgreSQL CREATE TABLE IF NOT EXISTS Usage Guide

The CREATE TABLE IF NOT EXISTS command in PostgreSQL is used to create a new table only if it does not already exist in the database. This