sparql_fdw sparql_fdw is a foreign data wrapper to access data available over the internet in the SPARQL format from within PostgreSQL based on Multicorn2. The soucre code and documentation is available on GitHub. A merge request to the original repository has been opened. General changes I have tested the extension after recent changes in Multicorn2 against PostgreSQL 15 and 16, which have not been supported by now. The installation examples had to be changed due to changes in Python 3.11, see PEP 668. The problem here is, that Pythons pip3 needs a parameter, –break-system-packages, to instal ..read more

pgsql_tweaks is a bundle of functions and views for PostgreSQL The soucre code is available on GitLab, a mirror is hosted on GitHub. One could install the whole package, or just copy what is needed from the source code. The extension is also available on PGXN. General changes In this release has been tested against PostgreSQL 17 beta 1.. There have been no new or changed features, therefore this is only a minor release ..read more

cassandra2_fdw Released The cassandra2_fdw is a foreign data wrapper to connect to Apache Cassandra database from inside PostgreSQL written in C. There hasn’t been any work on this foreign data wrapper for a long time. When I tried to use it, it didn’t work at all. As the original goal was to convert data from Cassandra into PostgreSQL, I gave it a try, to bring it up to date. First I took care of using the right PostgreSQL library files for the currently supported versions, which are 10 to 14. Next step has been to rework and extend the supported data types. . In addition I rewrote the docume ..read more

Most databases have users and groups to handle access rights. PostgreSQL is different as there are only roles. The Application User Story A new app has to be developed. The choosen RDBMS is PostgreSQL. The application does need different roles: A user to create objects A user for the application with rights to add and change data A group for different users for reporting with read only rights Creating Users PostgreSQL does not have users, there are only roles. A user role needs to be able to login and a password. In addition the a superuser or a role with the right CREATEROLE has to be used ..read more

I just want to expain how I discovered PostgreSQL and what my history is in terms of working with data and databases. How I Started With Data When I learned COBOL I also learned to handle data structures, because that’s what this language is about: doing stuff with data. And a big thanks to Grace Hopper whom I really admire. I liked it a lot because it was so easy to do things with data. Discovering Databases Later on, I discovered databases and it made life handling data much easier. What I used at the time is long dead and forgotten. SQL wasn’t around - back then, there was only one seller ..read more

Using PostgreSQL On Android There is an app for Android users, which will give you a terminal: Termux. With it’s package management you can install your beloved PostgreSQL. That does also include having PostGIS. There might also be an old Termux app available in the Google Play Store. Do not install this version, it is outdated and will not be updated anymore! Installation Of F-Droid F-Droid is an alternative package app store for Android. To install it, you need to change your Android settings and to allow external installations. After the installation is done, you open the F-Droid and search ..read more

pgsql_tweaks is a bundle of functions and views for PostgreSQL The soucre code is available on GitLab, a mirror is hosted on GitHub. One could install the whole package, or just copy what is needed from the source code. The extension is also available on PGXN. General changes In this release the recommended PostgreSQL version has been changed to 15. The test file does not include times anymore. There have been no new or changed features, therefore this is only a minor release ..read more

There are tons of blogs about PostgreSQL available on the web, including this one. There are some good opportunities, where you can learn PostgreSQL as a developer or DBA, but a good starting point is always the original PostgreSQL Documentation. If you are not sure about something, for example the parameters of a function, or tools like psql, the documentation almost always has the answer. Available For Free There are some websites available, where you can learn PostgreSQL for free. There is a list available on postgresql.org. PostgreSQL Tutorial It’s perfect to either, walk through the lesso ..read more

History PostgreSQL supports two types of JSON implementations: JSON and JSONB. The first implementation of JSON has been released in PostgreSQL 9.2 in 2012. JSONB has been added two years later in PostgreSQL 9.4. There are still two JSON standards, that differ. One is RFC7159 by Douglas Crockford. The other one the ECMA 404. PostgreSQL is using the RFC7159. Compared to the ANSI SQL standard, which is often not really human readable, this standard is short and easy to understand, it has only 15 pages. In March 2017 the ISO published a new standard, ISO/IEC TR 19075-6:2017, that defines how to i ..read more

The amount of configuration parameters have grown a lot since when I started using PostgreSQL. With PostgeSQL 14, the current version at the time writing, there are currently 346 parameters, that can be configured. Most of the time it is unnecessary to touch most of them. On the other hand, the default configuration is anything but usable for nearly anything, except en embedded environment. Looking At Configuration Parameters This can easily be solved with SQL: SHOW ALL; That results in three column listing of all parameters with their current setting and a decent description, what the para ..read more