Django's QuerySet union isn't quite what it seems 27 June 2016 in technical
Django claims that QuerySets support a union operator. It turns out that doesn't actually give you a union of two query sets, and it can silently munge your query.
Your RDBMS has cool features 26 June 2016 in technical
There are plenty of cool features in relational database management systems (e.g. PostgreSQL, MariaDB). It turns out it actually makes sense to use them when building applications.