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/186#issuecomment-897600677,https://api.github.com/repos/simonw/sqlite-utils/issues/186,897600677,IC_kwDOCGYnMM41gEyl,9308268,2021-08-12T12:32:14Z,2021-08-12T12:32:14Z,NONE,"Actually, I forgot to include the `bib_pub_year` in the extract ... 

But also, I tried again with empty string values instead of `NULL` values and it seems to place the foreign key properly / correctly... 

```python3
sql = """"""\
INSERT INTO ""circulation_info"" (""item_id"", ""bib_title"", ""bib_creator"", ""bib_format"", ""bib_pub_year"", ""checkout_date"")
VALUES
(1, ""title one"", ""creator one"", ""Book"", 2018, ""2021-08-12 00:01""),
(2, ""title two"", ""creator one"", ""Book"", 2019, ""2021-08-12 00:02""),
(3, ""title three"", """", ""DVD"", 2020, ""2021-08-12 00:03""),
(4, ""title four"", """", ""DVD"", """", ""2021-08-12 00:04""),
(5, ""title five"", """", ""DVD"", """", ""2021-08-12 00:05"")
""""""

with sqlite3.connect('test_bib_2.db') as con:
    con.execute(sql)
```

```python3
db[""circulation_info""].extract(
    [
        ""bib_title"",
        ""bib_creator"",
        ""bib_format"",
        ""bib_pub_year""
    ],
    table=""bib_info"", 
    fk_column=""bib_info_id""
)
```

```
{'id': 1, 'item_id': 1, 'bib_info_id': 1, 'bib_pub_year': 2018, 'checkout_date': '2021-08-12 00:01'}
{'id': 2, 'item_id': 2, 'bib_info_id': 2, 'bib_pub_year': 2019, 'checkout_date': '2021-08-12 00:02'}
{'id': 3, 'item_id': 3, 'bib_info_id': 3, 'bib_pub_year': 2020, 'checkout_date': '2021-08-12 00:03'}
{'id': 4, 'item_id': 4, 'bib_info_id': 4, 'bib_pub_year': '', 'checkout_date': '2021-08-12 00:04'}
{'id': 5, 'item_id': 5, 'bib_info_id': 5, 'bib_pub_year': '', 'checkout_date': '2021-08-12 00:05'}

---

{'id': 1, 'bib_title': 'title one', 'bib_creator': 'creator one', 'bib_format': 'Book'}
{'id': 2, 'bib_title': 'title two', 'bib_creator': 'creator one', 'bib_format': 'Book'}
{'id': 3, 'bib_title': 'title three', 'bib_creator': '', 'bib_format': 'DVD'}
{'id': 4, 'bib_title': 'title four', 'bib_creator': '', 'bib_format': 'DVD'}
{'id': 5, 'bib_title': 'title five', 'bib_creator': '', 'bib_format': 'DVD'}
```
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