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PostgresSQL: Implicit vs. explicit joins
If you happen to be an SQL developer, you will know that joins are really at the core of the language. Joins come in various flavors: Inner joins, left joins, full joins, natural joins, self joins, semi-joins, lateral joins, and so on. However, one of the most important distinctions is the difference between implicit and […]
Machine Learning in PostgreSQL Part 1: Kmeans clustering
Machine Learning in 10 Lines Every person that reads newspapers, magazines or any other media of general interest has at least a basic idea of what Machine Learning is. And this is not only a fashion, Machine Learning is already part of our everyday life and will be much more in the future: from personalized […]
Killed index tuples
Since I only recently learned about the concept of “killed index tuples”, I thought there might be some others who are not yet familiar with this interesting PostgreSQL concept. This may give you an explanation the next time you encounter wildly varying execution times for the same execution plan of the same PostgreSQL query. […]