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Hans-Jürgen Schönig

82 articles by Hans-Jürgen Schönig.

Databases — PostgreSQL: How to write a trigger

PostgreSQL: How to write a trigger

UPDATED 2023: A trigger is a way to automatically respond to events. This is a tutorial on how to manage and program triggers in PostgreSQL.

HSHans-Jürgen SchönigHans-Jürgen Schönig·February 23, 2021Databases
Databases — Golden Proportions in PostgreSQL

Golden Proportions in PostgreSQL

Learn how PostgreSQL can help with basic calculations regarding golden proportions. Do mathematics in your database development work.

HSHans-Jürgen SchönigHans-Jürgen Schönig·January 21, 2021Databases
Databases — Upgrading and updating PostgreSQL

Upgrading and updating PostgreSQL

Update/ upgrade: what's the difference? This blog post covers the best ways of upgrading or updating PostgreSQL to the latest release.

HSHans-Jürgen SchönigHans-Jürgen Schönig·December 9, 2020Databases
Databases — PostgreSQL: GROUP BY expression

PostgreSQL: GROUP BY expression

GROUP BY is an integral part of SQL and PostgreSQL. You might not know that the GROUP BY expression can handle more than just simple fields.

HSHans-Jürgen SchönigHans-Jürgen Schönig·August 19, 2020Databases