Translating MySQL Queries with Variable Usage to PostgreSQL Queries: A Comparative Analysis of Alternatives

Based on the provided specification, I will create a complete response that meets all the requirements. Here is the final answer:

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

How to Divide a Sum Obtained from GROUP BY: A Step-by-Step Guide to Achieving Desired Output Ratio

Resolving Complex Queries: A PostgreSQL Approach to Three Tables and Duplicate Rows

Optimizing SQL Queries for Aggregation and Filtering with FILTER Operator

Create a Trigger Function in PostgreSQL to Update the Parent Table's Timestamp

Optimizing Data Insertion into M Table Based on Day of the Week Conditions

Updating Values in a Table Based on Data from Another Table Using Joins

How to Load a Wikipedia Dump into Postgres: A Practical Guide to Overcoming Common Challenges