This topic is part of a series. It is meant to be a place for users to discuss creative projects they have been working on.

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Here is my schema:

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

How do I add a `UNIQUE` constraint?

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I've always been enticed by 8 bit computer projects like this but I've never bought any because I can't think of anything I'd do with them given their self-contained nature. Even a really primitive ethernet controller would explode the project possibilities. Does anything like that exist?