PostgreSQL
SQL Improvements in PostgreSQL 11–18: A Personal Selection
Seven major versions of PostgreSQL shipped between 2018 and 2025, one per year without exception, and each with a changelog of 150 to 200 user-visible changes. Each …
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SQL
13 posts
PostgreSQL
Simple Data Modeling with a Test Data Set
In How to Write SQL we saw how to write SQL queries as separate .sql files, and we learnt about using query parameters with the psql syntax for that (:variable, …
PostgreSQL
The Mode Ordered-Set Aggregate Function
In our article Exploring a Data Set in SQL we discovered a data set related to music: the Chinook sample database. Our discovery led us to find albums containing tracks …
PostgreSQL
What's in a name: “Mastering”
Now that my book Mastering PostgreSQL in Application Development is released (and selling well, thanks guys!), I’ve had some questions about the title. The idea is …
PostgreSQL
Mastering PostgreSQL in Application Development launches!
Today is the day my book Mastering PostgreSQL in Application Development launches! I’m all excited that everybody interested is now able to actually read my book! …
PostgreSQL
Mastering PostgreSQL in Application Development
Mastering PostgreSQL in Application Development is the full title of the book I am currently writing. Running the PostgreSQL is YeSQL series of blog posts has shown me …
PostgreSQL
Regular Expressions and Grouping Sets
There’s a very rich set of PostgreSQL functions to process text, you can find them all at the String Functions and Operators documentation chapter, with functions …
PostgreSQL
SQL Regression Tests
In a previous article here we saw How to Write SQL in your application code. The main idea in that article is to maintain your queries in separate SQL files, where …
PostgreSQL
Playing with Unicode
The reason why I like Unicode a lot is because it allows me to code in text based environments and still have nice output. Today, we’re going to play with Regional …
PostgreSQL
PostgreSQL and the calendar
The modern calendar is a trap for the young engineer’s mind. We deal with the calendar on a daily basis and until exposed to its insanity it’s rather common …
PostgreSQL
SQL and Business Logic
Business logic is supposed to be the part of the application where you deal with customer or user facing decisions and computations. It is often argued that this part …
PostgreSQL
Exploring a Data Set in SQL
Sometimes you need to dive in an existing data set that you know very little about. Let’s say we’ve been lucky to have had a high level description of the …