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Unfortunately, the raspiBackup documentation on this website had become increasingly disorganized over time. Fortunately, someone noticed this and offered to create a raspiBackup documentation page on GitHub using mdbook. He uploaded all existing raspiBackup pages from this website to GitHub, built a framework so the pages could be organized and easily edited—which was urgently needed—and finally ensured that any changes to the documentation are automatically republished. He even built in a DeepL integration so that the German documentation can be translated into English very quickly. Until then, I had always translated the German texts manually, which of course takes longer.
I don’t have the technical know-how to do this myself, and I’m extremely grateful to rpi-simonz for setting everything up for me, making the raspiBackup documentation clearer and much easier to maintain and edit.
In short: The complete raspiBackup documentation can now be found here. Questions about raspiBackup can be asked here, and please report any issues here on GitHub (GitHub registration is free ;-) ) There’s also a raspiBackup thread on the English RaspberryPi Forum where you can ask questions about raspiBackup.
In addition there exist social media channels for raspiBackup.
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Some SQL DBMs allow to create recursive queries. That's a feature of DB2 (free download ), SQL Server and Oracle. Unfortunately mySQL misses this feature. But every recursive algorithm can be written in a non recursive way - so it's not clear whether this is a need or just a nice DBMS feature. Anyhow - it's an interesting topic.
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I collected on the following pages various SQL queries and their results on a sample database. They use different SQL functions and will help to learn and understand SQL queries. In addition they help for look up most commonSQL syntax examples. A SQL beginner will get a good overview about the capabilities of SQL. Examples are given for select, count, union, where, having, order, limit, views, NULL, like, subselects and joins.