Mastering Window Functions in SQL: A Comprehensive Guide to Calculating Values from Current Row and Previous Row

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)

Optimizing Table Join Performance by Moving Operations Outside GROUP BY Clause in SQL Server

Understanding Tableau Trend Lines and Date Calculations: A Comprehensive Guide to Creating a Powerful Dashboard

Optimizing Slow Select Performance on Tables with Large Result Sets Using GUIDs vs Integer-Based Solutions

Exclude Amounts Ending with '0' or '5' Using SQL Modulus Operation or Regular Expressions

Grouping List of Events by Quarters of the Year 2021: A Step-by-Step Guide Using SQL Server

Handling MM:SS.0 Format Without Timezone in PostgreSQL: A Step-by-Step Guide

Joining Three Tables in SQL: A Step-by-Step Guide to Understanding Inner, Left, and Right Joins and How to Correctly Define Join Conditions for Optimal Results.

Understanding the Correct Syntax for Multiple Temporary Tables in SQL Server