Postgres and Open Source Experts

In Postgres, the CREATE VIEW statement defines a new view based on the selected table(s). To create a view from several tables, use the CREATE VIEW statement with INNER JOIN.

In PostgreSQL, the “\d”, “\dv”, “\dv+” commands, “information_schema.views”, etc., are used to list all the views from a database.

In Postgres, the ALTER VIEW command modifies the views’ definition, such as setting the column's default value, changing the view’s owner, renaming a view, etc.

Postgres provides a “CREATE OR REPLACE VIEW” statement to create a new view or replace an existing view's defining query. It allows us to modify the defining query of a view without dropping a view. It defines a new view if the desired view doesn’t exist already or modifies the view’s defining query if it already exists.

This blog explains how to replace the view’s definition using the “CREATE or …

In PostgreSQL, the “\d” command, “\d+” command, “information_schema”, and “pgAdmin” are used to list all columns of a table.

“\List”, “\l”, and “pg_database” is used in SQL Shell to get the database list. While to switch databases in SQL Shell, the “\c” and “\connect” commands are used.

This post demonstrates stepwise instructions for importing CSV to Postgres or exporting Postgres tables to CSV files using pgAdmin.

PostgreSQL allows us to import CSV files to Postgres tables or export Postgres tables to CSV files using SQL Shell (psql). To do that, the “\COPY” command is used.

PostgreSQL is a powerful object-relational database management system that offers a growing range of extensions to provide features and functionality unmatched by others. One such extension that has recently become fully open-source is Citus. Citus Data originated in 2011, was open sourced as an extension to PostgreSQL in 2016, and was acquired by Microsoft in 2019. As of June 2022, all Enterprise features have been made available for free, and Citus is now 100% open source!

Postgres provides an INNER JOIN clause to combine the records of multiple tables based on a specific condition/criteria.