issues: 1754174496

This data as json

id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association pull_request body repo type active_lock_reason performed_via_github_app reactions draft state_reason
1754174496 I_kwDOCGYnMM5ojpQg 558 Ability to define unique columns when creating a table 1910303 open 0     0 2023-06-13T06:56:19Z 2023-08-18T01:06:03Z   NONE  

When creating a new table, it would be good to have an option to set unique columns similar to how not_null is set.

```python from sqlite_utils import Database

columns = {"mRID": str, "name": str} db = Database("example.db") db["ExampleTable"].create(columns, pk="mRID", not_null=["mRID"], if_not_exists=True) db["ExampleTable"].create_index(["mRID"], unique=True, if_not_exists=True) ```

So something like this would add the UNIQUE flag to the table definition.

python db["ExampleTable"].create(columns, pk="mRID", not_null=["mRID"], unique=["mRID"], if_not_exists=True)

sql CREATE TABLE ExampleTable ( mRID TEXT PRIMARY KEY NOT NULL UNIQUE, name TEXT );

 140912432 issue     
{
    "url": "https://api.github.com/repos/simonw/sqlite-utils/issues/558/reactions",
    "total_count": 0,
    "+1": 0,
    "-1": 0,
    "laugh": 0,
    "hooray": 0,
    "confused": 0,
    "heart": 0,
    "rocket": 0,
    "eyes": 0
}
    

Links from other tables