Converting OR Condition to UNION Clause in Correlated Subquery: A Correct Solution Using Union with DISTINCT

Resolving Ambiguity in Database Queries: A Step-by-Step Solution Using Subqueries and LEFT JOINs

Optimizing SQL Left Join Performance: Strategies and Alternative Solutions

Mastering SQL Left Join Queries with All Restrictions from Result

Using the OR Operator in SQL Queries for Conditional Logic

Using CROSS JOIN to Achieve Desired Outcome Without Common Columns in Relational Databases

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)

Maximizing Bookings per State with MySQL 8.0 Window Functions

Splitting a Column Value into Two Separate Columns in MySQL Using Window Functions

SQL Group By Return Null If One Is Null: Solving the Puzzle of Partially Deleted Orders