sql_inheritance: Tutorial about using postgreSQL Inheritance

[falkmielke]

Description

I was evaluating whether to overhaul part of our main database by using inheritance.
This required some sandbox data to test specific cases.
I figured it might be useful to immediately write up a tutorial notebook.
I doubt that many people at INBO will have immediate use for it; however, I did not find many other practical tutorials which explore the details and implications for our specific use case.

Task list

• My tutorial or article is placed in a subfolder of tutorials/content/
• The novel tutorial has a meaningful name, in relation to the content of the tutorial.
• The filename of my tutorial or article is index.md. In case of an Rmarkdown tutorial I have knitted my index.Rmd to index.md (both files are pushed to the repo).
• yaml header:
  • (recommended) I am included as author in the authors yaml tag, using [MY_AUTHOR_ID]. An author information file exists in <tutorials>/data/authors/<author>.toml.
  • I have added categories to the YAML header and my category tags are from the list of categories.
  • I have included meaningful and applicable tags (i.e. keywords) in the YAML header to improve the visibility of the new tutorial (see the tags listed in the tutorials website side bar).
  • The date is in format YYYY-MM-DD and adjusted.
• (recommended) I have previewed this PR locally (see steps below; ask previous contributors for help) and confirmed that the new content renders as expected.

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This provides a way to preview how these updates will look on the website, useful to contributors and reviewers.

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Alternative: Locally Building the Site

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This requires Hugo to be installed on your computer.

[ElsLommelen]

Interesting, and nicely written! I just added some minor suggestions, I hope they are useful (otherwise feel free to ignore them).
(I'll let you have a look first and I'll approve when you are finished, as I recently encountered some situations where the approval had to be done again after new commits were added.)

[ElsLommelen]

Suggested change

	Installation on Windows can be [achieved via an installer](https://www.postgresql.org/download/windows/) and documented elsewhere.
	Installation on Windows can be [achieved via an installer](https://www.postgresql.org/download/windows/) as documented elsewhere.

Or: and is documented elsewhere

[ElsLommelen]

Is this also needed for Windows OS, or does the above installer do the whole installation including the right package?

[ElsLommelen]

What about unique primary keys for these inherited tables? Do they need an extra PK, or is it enough to inherit the PK from table Activities? You may want to add the PK in the earlier example to demonstrate this more clearly.

[ElsLommelen]

Why is the output missing here?

[ElsLommelen]

It could be useful to mention how these tables could be updated in an easy way: the below part is titled advanced and it may discourage readers that are less familiar with databases but want to incorporate the inheritance for a better database structure. While it might not be needed to demonstrate this all in code, you may want to mention in one sentense that this update could be performed in table PushUps (if true)?