Optimizing Queries for Top Rows with Latest Related Row in Joined Tables

SELECT DISTINCT ON (user_id, activity_type_id, EXTRACT(year FROM start_date_local))

Joining Two Tables and Getting the Most Recent Records for a Given Name: A SQL Solution Using Correlated Subqueries

Optimizing PostgreSQL Queries: A More Efficient Approach for Retrieving Customer Book Purchase Data

Get Top 1 Row of Each Group: A Comprehensive Guide to Aggregate Functions and Data Normalization

Resolving MySQL Error: Using Non-Aggregated Columns in GROUP BY Clause