Merge Join Algorithm
Introduction In this article, we are going to see how the Merge Join Algorithm, also known as Sort-Merge Join, works and when it’s suitable for a relational database system to employ it in order to execute an SQL JOIN query.
Hash Join Algorithm
Introduction In this article, we are going to see how the Hash Join Algorithm works and when it’s suitable for a relational database system to employ it in order to execute an SQL JOIN query.
Nested Loop Join Algorithm
Introduction In this article, we are going to see how the Nested Loop Join Algorithm works and when it’s suitable for a relational database system to employ it in order to execute an SQL JOIN query.
How to get a JSON property value using PostgreSQL
Introduction In this article, I’m going to explain how you can get a JSON property value using the ->> PostgreSQL operator. This way, we can transform a JSON object that’s stored in a json or jsonb column into a virtual relational database table. While it’s a good idea to design the database schema according to the relational model, there are also situations when the relational model is way too strict. For instance, as I explained in this article, when implementing an audit log mechanism using database triggers, it’s very convenient to store… Read More
SQL LATERAL JOIN – A Beginner’s Guide
Introduction In this article, we are going to see how the SQL LATERAL JOIN works, and how we can use it to cross-reference rows from a subquery with rows in the outer table and build compound result sets. A LATERAL JOIN can be used either explicitly, as we will see in this article, or implicitly as it’s the case for the MySQL JSON_TABLE function.
