html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/sqlite-utils/issues/46#issuecomment-592999503,https://api.github.com/repos/simonw/sqlite-utils/issues/46,592999503,MDEyOklzc3VlQ29tbWVudDU5Mjk5OTUwMw==,35075,2020-02-29T22:08:20Z,2020-02-29T22:08:20Z,NONE,"@simonw any thoughts on allow extracts to specify the lookup column name? If I'm understanding the documentation right, `.lookup()` allows you to define the ""value"" column (the documentation uses name), but when you use `extracts` keyword as part of `.insert()`, `.upsert()` etc. the lookup must be done against a column named ""value"". I have an existing lookup table that I've populated with columns ""id"" and ""name"" as opposed to ""id"" and ""value"", and seems I can't use `extracts=`, unless I'm missing something...

Initial thought on how to do this would be to allow the dictionary value to be a tuple of table name column pair... so:
```
table = db.table(""trees"", extracts={""species_id"": (""Species"", ""name""})
```

I haven't dug too much into the existing code yet, but does this make sense? Worth doing?

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