Mastering COUNT with Aggregate Operations in PostgreSQL for Advanced Data Analysis

Optimizing SQL Performance with JOIN in EXISTS Queries: Strategies and Best Practices

How to Fix SQL Distinct with ORDER BY: Avoiding Duplicates and Getting the Right Results

How to Update PostgreSQL's last_update_date Field Automatically When a Table Modification Occurs

Querying Other Tables Within ARRAY_AGG Rows in PostgreSQL: A Step-by-Step Solution

Inserting Values with Foreign Key: A Step-by-Step Guide

Optimizing SQL Queries for Performance: A Step-by-Step Guide

Optimizing Finding Max Value per Year and String Attribute for Efficient Data Retrieval in SQL

Comparing Class Enrollment in Percentage Terms Using SQL.

Database Server Connection Loss: Understanding the Issue and Possible Solutions