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?

Have you watched any TV shows recently you want to discuss? Any shows you want to recommend or are hyped about? Feel free to discuss anything here.

Please just try to provide fair warning of spoilers if you can.

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This thread is posted weekly, and is intended as a place for more-casual discussion of the coronavirus and questions/updates that may not warrant their own dedicated topics. Tell us about what the situation is like where you live!

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).