PostgreSQL
Auditing Changes with Hstore
In a previous article about Trigger Parameters we have been using the extension hstore in order to compute some extra field in our records, where the fields used both for …
Getting more out of PostgreSQL
Notes on SQL technique, data modeling, and PostgreSQL internals — from the author of The Art of PostgreSQL. New articles are built on the free Lab so you can run every query yourself.
PostgreSQL
Trigger Parameters
Sometimes you want to compute values automatically at INSERT time, like for example a duration column out of a start and an end column, both timestamptz. It’s easy …
PostgreSQL
Understanding Window Functions
There was SQL before window functions and SQL after window functions: that’s how powerful this tool is. Being that of a deal breaker unfortunately means that it can …
Projects
Migrating from MySQL to PostgreSQL
About the only time when I will accept to work with MySQL is when you need help to migrate away from it because you decided to move to PostgreSQL instead. And it’s …
PostgreSQL
How far is the nearest pub?
In our recent article about The Most Popular Pub Names we did have a look at how to find the pubs nearby, but didn’t compute the distance in between that pub and …
PostgreSQL
The Most Popular Pub Names
In his article titled The Most Popular Pub Names Ross Lawley did show us how to perform some quite interesting geographic queries against MongoDB, using some nice Open …
Conferences
OSCON, Portland, and PDXPUG
After spending an awesome week in San Francisco, CA I’m lucky enough to be spending another week in the USA, in Portand, OR. The main excuse for showing up here has …
Conferences
Talking at the SFPUG
Those days feel really lucky to me. I’m currently visiting friends and customers in San Francisco, and really enjoying my trip here! Of course Josh Berkus took the …
Conferences
Back from CHAR(13)
Last week was held the CHAR(13) conference in a great venue in the UK countryside. Not only did we discover UK under good weather conditions and some local beers, we also …
Software Programming
Emacs Muse meets Common Lisp
This blog of mine is written in the very good Emacs Muse format, that I find much more friendly to writing articles than both org-mode and markdown-mode that I both use …
PostgreSQL
Archiving data as fast as possible
In a recent article here we’ve been talking about how do do Batch Updates in a very efficient way, using the Writable CTE features available in PostgreSQL 9.1. I …
PostgreSQL
Simple Case for Pivoting in SQL
In a recent article Craig Kerstiens from Heroku did demo the really useful crosstab extension. That function allows you to pivot a table so that you can see the data from …