PostgreSQL

The Problem Encountering errors in PostgreSQL can halt your database operations and querying progress. One such common error is “Relation ‘some_relation_name’ does not exist” (in the following examples in this......

The Problem Duplicate key violations occur in PostgreSQL when an INSERT or UPDATE operation attempts to insert or modify a record that would violate a unique constraint, commonly due to a primary key or unique index. Catching and......

Introduction Dealing with regular expressions can sometimes lead to unexpected errors, especially when used in SQL queries. One common error in PostgreSQL is related to invalid escape sequences in regular expressions. This usually......

Introduction When working with PostgreSQL, users might encounter a ‘column does not exist’ error even when the column clearly exists in the database schema. This error can be perplexing but often arises from simple......

Introduction PostgreSQL offers powerful JSON data type support, enabling users to store schema-less data. This article dives into the intricacies of updating and deleting parts of that JSON data, serving as a guide through the......

Introduction In PostgreSQL, UNION is used to combine the results of two SELECT statements. However, sometimes you might want to order the results in a specific way without using the ORDER BY clause. This tutorial will demonstrate how......

Overview The LEAD and LAG functions are a part of the window function family provided by PostgreSQL. Window functions allow users to perform calculations across sets of rows that are related to the current query row. History and......

Introduction Exploring the intricacies of window functions in PostgreSQL, this tutorial delves into FIRST_VALUE, LAST_VALUE, and NTH_VALUE, detailing their uses and advantages in database querying with practical......

Introduction Using SELECT without FROM in PostgreSQL can be powerful for generating values, performing calculations, or retrieving server configurations without querying actual tables. Basic Usage of SELECT without FROM To begin......

Introduction Diving into relational databases often entails complex queries, especially when merging data from multiple tables. This tutorial will focus on employing subqueries alongside JOINs in PostgreSQL to create powerful and......

Introduction Understanding the size of table indexes is crucial for maintaining efficient database performance. In PostgreSQL, the specifics of index size can guide optimization and tuning efforts. Index Basics In PostgreSQL, an......

Overview Understanding how to efficiently remove indexes is just as critical as knowing how to create them. In this tutorial, we’ll explore how to drop an index in PostgreSQL through practical examples and best practices,......