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Found the example below in a book teaching logical database design, but I'm stuck on how one would implement this in PostreSQL: The diagram reflects the following business rule: An instructor...
Context: I have a varchar column in a segment event table that contains version numbers. Most of these are formatted nicely as X.Y.Z (major.minor.patch) where X, Y, and Z are integers. However, the...
In JSON Schema one can use the additionalProperties key to validate properties whose names are not know. You can still impose restrictions on their type. How to do this in an Ansible role argument...
Ansible's extract filter is supposedly made for use in map, but at the time of writing the documentation doesn't actually show how to use it together with the map filter. The following outputs VAR...
print() normally adds text to STDOUT, it does not erase existing text. https://linux.codidact.com/posts/289869 describes various ways of doing the overwrite in shell scripts. How can you do this ...
VS Code supports regex search, but the search/replace is UI is just a tiny dialog box. It's okay if you know regex well and the expression is not complex, but when trying to apply complicated expre...
When you do: cd /some/path code . VS Code opens with that location shown in the "Explorer" sidebar. However, the state of the file tree and the currently open files will be the same as what wa...
MWE import random import pandas as pd from itertools import product random.seed(12345) dies = [1, 2] cells = list(range(10)) currents = [100, 200, 300] dcc = list(product(dies, ce...
I'm trying to replace Flot.js with Chart.js. In my application, Flot.js is included as a normal JavaScript file, like so: <script language="javascript" type="text/javascript" src="jquery.flot-...
Amazon product URLs are often very long, but on experimentation it is revealed that the following pattern is sufficient: https://www.amazon.com/{dp|gp}/$ID ID is a 10-char string, which I'm gue...
Is there a way to easily insert today's date when editing a file in VS Code?
What is the best way to convert Dos paths to Posix paths in Powershell? eg given: C:\Program Files\PowerShell\Modules\ I want something like: /Program\ Files/PowerShell/Modules/ Is the only so...
My redirect in javascript somehow gets "hijacked" and I don't understand how. Previous developer (who is no longer working with the company) on page load initialized onbeforeunload event like so: ...
If I run ls() in R, it shows the variables (including functions) in my workspace. But there are other variables visible too, e.g. functions from packages like ls itself. And if I write a function...
I am currently working with LWJGL and the obstacle I face right now on my project is rendering textures to a cube, e.x a set of 8 vertices with position, color, and UV information. For now, I am st...
I've figured out that code --new-window /foo/bar/baz.txt will open baz.txt in a new window. But when I do this, it says "no folder opened" in the file explorer pane. That makes it hard to work with...
I am working with JSF 2.3 and have a selectManyMenu component that is marked as required but that I want to be cleared if the user unselects all items. Currently, the user can unselect all items, b...
I've created a code snippet in "functions.php" that should add another product to your cart if you mark the checkbox, but somehow, only the original product is add (like the single product from the...
How to delete a local git branch which hasn't been pushed to anywhere, and only exists locally?
When reading about various operators used by programming languages, the term "short circuit behavior" is often used. For example in this C code: int a = 0; a && b++ Someone explained t...
Lets say I have two tables, A and B and I need to join a subset of them. Is there best practices of sticking the conditions in the WHERE clause like this, SELECT * FROM A JOIN B on a.fk_b = b....
I have a few different projects that rely on open source technology that I wish to make modifications to (say, to add key features for business or personal use) that will vary between upstreamable ...
One way to remove element from array is to replace element with zero. Below is a rough snippet I am sharing: int N = sc.nextInt(); int pos = sc.nextInt(); int A[] = new int[N]; if(pos == i) { ...
Working with dbt version 2 I'm trying to set up source checks but I'm running into an issue where the column names I'm setting tests for have dashes (e.g. my_table.some-field-with-dash). I current...
I have a large and complex PostgreSQL SELECT query that I would like to make faster. EXPLAIN suggests it should run quickly, with the worst parts being scans of a few thousand rows. When run, it do...
I need help figuring out if my dependencies need upgrading or conflict with each other. I tried using the command prompt to solve problems but it didn't help. Here is my code. Android Studio Iguan...
Is there a Python serialization format that has capabilities similar to Pickle, but is text based? The problem I always have with pickle is that it's binary, so I can't manually view or edit the d...
Background Many Python programs now recommend installing with pipx, and there is a sense that you shouldn't install with pip anymore, you should use tools like pipx. Main Question However, what ...
I need to do a lot of calculations involving sets. There are relatively few values in the "universe" of candidates that could appear in any of the sets, but potentially very many such sets (they mi...
I often find it useful to arrange things so that each commit on master's first-parent is a discrete change. It allows git log --first-parent --oneline to be used as a concise, automatically-generat...
This revolves around images. I'm trying to write an HTML page of COVID-19 safety procedures, and here's what I've written so far: <!DOCTYPE html> <html> <head> <title&...
I am in need of downloading some files (from dynamic list of URLs) and archive them into a single zip file. Since these files can be arbitrarily sized (totaling hundreds of MB), I want to avoid dow...
I regularly run into the problem that I have a Python function that I want to use in both, eager and graph execution mode. I therefore have to adjust the code so that it can handle both situations....
Consider the following arbitrarily-nested JSON as input to a jq filter: echo '[{"foo": [1, 2]}, {"bar": [{"baz": ["foo", "baz"]}]}]' | jq '.' My goal is to join leaf arrays into strings: [{"fo...
TL;DR Is (a and b) equivalent to tf.logical_and(a, b) in terms of optimization and performance? (a and b are tensorflow tensors) Details I use Python with Tensorflow. My priorities are Make t...
I use git submodule foreach git pull to update my submodules. There's quite a few and it appears that foreach is updating them one by one, instead of in parallel. How can I do it in parallel?
I have a Python program like this: done = False while u and not done: i = u.pop() print(f"Processing {i}") do_big_task(i) finish_up() Since this takes a long time, the user m...
I have created a directory named Temporary_add_to_version_control on Desktop. Now I am trying to reach that directory by typing the following in git-bash: cd ~/Desktop/Temporary_add_to_version_con...
Among other things, a URL consists of a host and a path: I was wondering (and couldn't find anything) if there's a name for the combination of host and path. Is there a name for these: examp...
From reading about the Crossfilter data manipulation library for JavaScript, I take it that "groups" are an important concept in its operation. However, the Crossfilter documentation does not ever...
I would like to use tf.timestamp() when it is available (eager mode and graph mode without XLA), and use 0. (or a better fallback if there is one) when it is not available (with XLA; @tf.function(j...
I'm trying to create an automatic text-to-link conversion feature in a TypeScript application. The desired workflow is: Copy a URL to the clipboard Select some text Paste the URL - this should...
When running various Python scripts, I often need to do this annoying dance: $ python script.py ... ModuleNotFoundError: No module named 'foo' $ pip install foo $ python script.py ... Module...
I want my CLI Python program to schedule a task, and then exit. After some times has passed (say 10 minutes) the task should execute. The task can be a Python method or a shell command, whatever i...
Looping in Ansible usually produces a neat output of one line per iteration (per host): ... ok: [Arch] => (item=something) ok: [Arch] => (item=something_else) ok: [Arch] => (item=yet_a...
I have been using open-source software, and the open-source Community is great at maintaining such projects. But I have observed something in smaller open-source projects. Whenever I demand some f...
I have created a tag in my project, using git tag v2023 However, I forgot to commit a few changes. Now I would like to move this tag to the current point (after having committed the changes I had...
I'm trying to revive an old project of mine. It was built with Phalcon PHP 2 or 3 (I don't even remember which version, but quite old). There I could include a call to the loop inside the controll...
This is meant as a FAQ Q&A regarding variable-length arrays (VLA). The two bugs described below are surprisingly common. I'm trying to use the variable-length arrays feature of C99 (and newe...
I am writing a Python package where I have two classes in different files that (indirectly) depend on each other. If I wouldn't care about type-hints, there would be no problem, but unfortunately,...
