Muhammad Ali plays matchmaker:
PostgreSQL employs various techniques for data joining and aggregation in its queries, among which the hash-based method stands out for its efficiency in particular situations and different data sizes. We will discuss hash joins and hash aggregates in PostgreSQL, providing insights on how they work and parameters which influence this algorithm.
Read on to learn more. This looks fundamentally similar to hash matches in SQL Server, so if you’re familiar with that, the concepts should be pretty clear.