MS Access Slow Linking Between ODBC and Local Tables? Then Don't Do It. | by Steve Sohcot | Medium
Learn SQL: INNER JOIN vs LEFT JOIN
tsql - SQL Server: INNER JOIN after UNION leads to slow Hash Match (Aggregate) - Stack Overflow
Are joins in databases inherently slow? Is there any way to optimize the speed of a left join query in MySQL - Quora
ORDER BY/INNER JOIN query is painfully slow · Issue #2040 · SemanticMediaWiki/SemanticMediaWiki · GitHub
Matt Kingshott on Twitter: "🔥 #Laravel Tip: Eloquent's 'whereExists' method is useful, but it relies on sub queries. A more efficient way to run the same query is an advanced inner join.