This is a recurring post to discuss programming or other technical projects that we've been working on. Tell us about one of your recent projects, either at work or personal projects. What's interesting about it? Are you having trouble with anything?

This thread is posted weekly on Thursday - please try to post relevant content in here, such as news, updates, opinion articles, etc. Especially significant updates may warrant a separate topic, but most should be posted here.

If you'd like to help support Ukraine, please visit the official site at https://help.gov.ua/ - an official portal for those who want to provide humanitarian or financial assistance to people of Ukraine, businesses or the government at the times of resistance against the Russian aggression.

It's a very broad question, but seeing the latest extremely worrying news from where I am made me wonder: how's everyone else getting on? Now that we're moving past the lockdowns and furloughs, do things look hopeful where you are?

Things in the UK are pretty bad right now - huge inflation, energy prices hitting points that will seriously harm people's financial stability just to stay warm in winter, unending political scandal, increasing pollution, and little real sign of a light at the end of the tunnel. I'm fortunate enough to be able to handle it at least for now, but I'm genuinely worried for those around me and for the country as a whole.

The pandemic hit us all hard, but it's difficult to gauge how hard. Obviously Brexit is an extra anchor around the UK's neck, but then the US has the legacy of Trump and mainland Europe has a war on the doorstep, so we're far from the only ones with problems. Are we in a uniquely bad position, or is this how everyone's feeling right now?

After re-watching the absolute masterpiece Close Encounters of the Third Kind (Spielberg, 1977), I was in awe. This got me thinking a lot about aliens, and it seems to me that that is an area where movies and TV shows have been lacking in recent years.

When I say "aliens", I mean something truly alien, foreign, mind-bending, even terrifying (although I'm not very fond of horror) -- so not the tame, often humanoid extraterrestrials that we fully understand, like you usually see in Star Trek and Trek-like shows. But rather stories of contact that make us rethink the boundaries of existence.

A recent movie that touches on that was 2016's Arrival, which has more than one similarity with Close Encounters.... Another is Contact (Robert Zemeckis, 1997).

General Programming Q&A thread! Ask any questions about programming, answer the questions of other users, or post suggestions for future threads.

Don't forget to format your code using the triple backticks or tildes:

Here is my schema:

```sql
CREATE TABLE article_to_warehouse (
  article_id   INTEGER
, warehouse_id INTEGER
)
;
```

How do I add a `UNIQUE` constraint?