Retrieving the Earliest Stock Price for Each Company: A Step-by-Step Guide

5 Free Remote Database Options for Shiny Apps: Scalable, Secure, and Cost-Effective Solutions

Breaking Down a Single Column into Multiple Columns in MySQL Using String Functions and REGEXP

Understanding User Variables in MySQL Sessions: Avoiding Retained Values Across Sessions

Excluding Time of Day from Day of Week in MySQL Queries Using WEEKDAY() and BETWEEN Operators

Retrieving Sales Data for Products with Multiple Sale Possibilities: A Comprehensive Guide

Using Max(), Sum(), and Subqueries to Simplify Complex Queries in SQL

Delete Records Based on Custom Threshold: A Step-by-Step Guide to Database Management

SELECT destinatario_id, mensagem, remetente_id, ROW_NUMBER() OVER (PARTITION BY destinatario_id ORDER BY created_at) AS row_num FROM mensagens m WHERE to_id = 1 AND created_at IN (SELECT min(created_at) FROM mensagens m2 WHERE m2.destinatario_id = m.destinatario_id)

Understanding the MySQL Performance Issue on Simple Join with No Indexes