Database-Independent Grouped Count Distinct "Days Ago" in Rails 6: A Comparative Approach to Handling Different Databases

Working with JSON Columns in PostgreSQL: A Deep Dive into Custom Aggregation Functions

Finding the Group with the Most Training Type Groups

How to Transform Data from Long Format to Wide Format Using Postgresql's MAX(CASE) Function

PostgreSQL Data Aggregation with Filtered Aggregations: A Step-by-Step Guide

Mastering Postgres List Data Type: A Guide to Associative Tables for Efficient Database Design

Using XML Columns in Where Clauses with PostgreSQL Using Java-Based Frameworks Like Hibernate

How to Retrieve Column Value If Present in Issue History Using Rails Active Record Query Methods

How to Insert Data from a CSV File into Tables with Foreign Keys Using Python and PostgreSQL

Understanding Zero as a Starting Position in SQL's SUBSTRING Functionality