html_url,issue_url,id,node_id,user,user_label,created_at,updated_at,author_association,body,reactions,issue,issue_label,performed_via_github_app
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-514509307,https://api.github.com/repos/simonw/sqlite-utils/issues/49,514509307,MDEyOklzc3VlQ29tbWVudDUxNDUwOTMwNw==,9599,simonw,2019-07-24T07:09:43Z,2019-07-24T07:10:21Z,OWNER,"This syntax should be shared with #42 as much as possible.

Maybe something based on a namedtuple would work, since those are already used in the library.

```python
workouts = db.table(""workouts"", extracts=[Extract(
    columns=[""source"", ""source_version""],
    table=""Sources""
)])
```
Since namedtuples cannot have default values this should probably be a class instead. Actually it looks like there is a trick for defaults here: https://stackoverflow.com/a/18348004","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710346830,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710346830,MDEyOklzc3VlQ29tbWVudDcxMDM0NjgzMA==,9599,simonw,2020-10-16T18:08:52Z,2020-10-16T18:09:21Z,OWNER,"The new `.extract()` method can handle multiple columns:

https://github.com/simonw/sqlite-utils/blob/2c541fac352632e23e40b0d21e3f233f7a744a57/tests/test_extract.py#L70-L87","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710359724,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710359724,MDEyOklzc3VlQ29tbWVudDcxMDM1OTcyNA==,9599,simonw,2020-10-16T18:15:31Z,2020-10-16T18:15:31Z,OWNER,"Using a tuple would work:
```python
fresh_db.table(""tree"", extracts=[(""common_name"", ""latin_name"")])
```
Or to define a custom name:
```python
fresh_db.table(""tree"", extracts={(""common_name"", ""latin_name""): ""names""})
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710363789,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710363789,MDEyOklzc3VlQ29tbWVudDcxMDM2Mzc4OQ==,9599,simonw,2020-10-16T18:18:05Z,2020-10-16T18:18:05Z,OWNER,I wonder if there's value in extending the `extracts=` option at all given the existence of `table.extract()`.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710364942,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710364942,MDEyOklzc3VlQ29tbWVudDcxMDM2NDk0Mg==,9599,simonw,2020-10-16T18:18:48Z,2020-10-16T18:18:48Z,OWNER,"I think there is. It's a nice existing feature, and I don't think adding tuple support to it would be a huge lift.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710390915,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710390915,MDEyOklzc3VlQ29tbWVudDcxMDM5MDkxNQ==,9599,simonw,2020-10-16T18:34:26Z,2020-10-16T18:34:50Z,OWNER,"Here's the most complex example of `.extracts()`:
```python
db[""Trees""].extract(
    [""CommonName"", ""LatinName""],
    table=""Species"",
    fk_column=""species_id"",
    rename={""CommonName"": ""name"", ""LatinName"": ""latin""}
)
```
Resulting in:
```sql
CREATE TABLE [Species] (
    [id] INTEGER PRIMARY KEY,
    [name] TEXT,
    [latin] TEXT
)
```
From https://sqlite-utils.readthedocs.io/en/stable/python-api.html#extracting-columns-into-a-separate-table","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710393550,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710393550,MDEyOklzc3VlQ29tbWVudDcxMDM5MzU1MA==,9599,simonw,2020-10-16T18:35:57Z,2020-10-16T18:36:39Z,OWNER,"If I want to support that most complicated example, I think the option to pass a `Extracts()` object to `extracts=` is the best way to do it:
```python
fresh_db.table(""tree"", extracts=[Extract(
    columns=(""CommonName"", ""LatinName""),
    table=""Species"",
    fk_column=""species_id"",
    rename={""CommonName"": ""name"", ""LatinName"": ""latin""}
)])
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710395444,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710395444,MDEyOklzc3VlQ29tbWVudDcxMDM5NTQ0NA==,9599,simonw,2020-10-16T18:37:10Z,2020-10-16T18:37:10Z,OWNER,"But this begins to feel too complicated, given that `table.extract()` can already be used to achieve the same thing.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710397574,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710397574,MDEyOklzc3VlQ29tbWVudDcxMDM5NzU3NA==,9599,simonw,2020-10-16T18:38:21Z,2020-10-16T18:38:21Z,OWNER,"I'm not going to implement this. I'll leave `extract=...` as it is right now, suitable for quick simple single-column operations on input, but if users want to do something more complicated involving multiple columns they should use the `table.extract()` method after the initial insert instead.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,
https://github.com/simonw/sqlite-utils/issues/49#issuecomment-710461468,https://api.github.com/repos/simonw/sqlite-utils/issues/49,710461468,MDEyOklzc3VlQ29tbWVudDcxMDQ2MTQ2OA==,9599,simonw,2020-10-16T19:18:19Z,2020-10-16T19:18:19Z,OWNER,"Reconsidering: #89 was a feature request that relates to this, so maybe this is worth implementing after all.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",472115381,extracts= should support multiple-column extracts,