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YOUR OWN AGGREGATION FUNCTIONS, WRITTEN

“Aggregate functions” are something that many people who have used PostgreSQL or SQL in general professionally or semi-professionally have run into. T…

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DATA PREPARATION FOR MACHINE LEARNING

You have probably noticed that artificial intelligence and machine learning are currently popular topics. Absolutely, as it is a very significant issu…

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Avoiding stored procedure calls in PostgreSQL that are not necessary

Almost any common language, like Perl, Python, or C, can be used to write stored procedures in PostgreSQL. Overall, this provides excellent flexibilit…

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POSTGRESQL: EASY DETECTION OF PERFORMANCE PROBLEMS 

Is there a single sizable, significant, and important database that does not occasionally experience performance issues? There are probably not too ma…

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An XMAX contains what?

xmaxis an MVCC (Multiversion Concurrency Control) system column in PostgreSQL. The documentation is rather succinct:

> The identity (transaction ID) …

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