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/datasette/issues/761#issuecomment-625003013,https://api.github.com/repos/simonw/datasette/issues/761,625003013,MDEyOklzc3VlQ29tbWVudDYyNTAwMzAxMw==,9599,simonw,2020-05-07T03:07:55Z,2020-05-07T03:09:05Z,OWNER,"Here's another demo I built using this feature: https://observablehq.com/@simonw/datasette-table-diagram

<img width=""995"" alt=""Datasette_foreign_key_diagram___Simon_Willison___Observable"" src=""https://user-images.githubusercontent.com/9599/81250291-6c89d600-8fd5-11ea-859c-d99a0de0531a.png"">

Running on this query:

```sql
select
  sqlite_master.name as table_from,
  fk_info.[from] as column_from,
  fk_info.[table] as table_to,
  fk_info.[to] as column_to
from
  sqlite_master
  join pragma_foreign_key_list(sqlite_master.name) as fk_info
order by
  sqlite_master.name
```
See https://github-to-sqlite.dogsheep.net/github?sql=select%0D%0A++sqlite_master.name+as+table_from%2C%0D%0A++fk_info.%5Bfrom%5D+as+column_from%2C%0D%0A++fk_info.%5Btable%5D+as+table_to%2C%0D%0A++fk_info.%5Bto%5D+as+column_to%0D%0Afrom%0D%0A++sqlite_master%0D%0A++join+pragma_foreign_key_list%28sqlite_master.name%29+as+fk_info%0D%0Aorder+by%0D%0A++sqlite_master.name","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,
https://github.com/simonw/datasette/issues/761#issuecomment-624790887,https://api.github.com/repos/simonw/datasette/issues/761,624790887,MDEyOklzc3VlQ29tbWVudDYyNDc5MDg4Nw==,9599,simonw,2020-05-06T17:41:21Z,2020-05-06T17:41:21Z,OWNER,More demos here: https://github.com/simonw/til/blob/master/sqlite/list-all-columns-in-a-database.md,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,
https://github.com/simonw/datasette/issues/761#issuecomment-624783996,https://api.github.com/repos/simonw/datasette/issues/761,624783996,MDEyOklzc3VlQ29tbWVudDYyNDc4Mzk5Ng==,9599,simonw,2020-05-06T17:28:20Z,2020-05-06T17:28:20Z,OWNER,"Interestingly https://latest.datasette.io/fixtures?sql=select+*+from+pragma_function_list() doesn't work, when it DOES work on my laptop. 

`latest.datasette.io` currently runs SQLite `3.27.2` while my laptop runs `3.31.1`

https://www.sqlite.org/changes.html#version_3_30_0 says that as-of 3.30.0:
> The PRAGMA function_list, PRAGMA module_list, and PRAGMA pragma_list commands are now enabled in all builds by default. Disable them using -DSQLITE_OMIT_INTROSPECTION_PRAGMAS. ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,
https://github.com/simonw/datasette/issues/761#issuecomment-624782775,https://api.github.com/repos/simonw/datasette/issues/761,624782775,MDEyOklzc3VlQ29tbWVudDYyNDc4Mjc3NQ==,9599,simonw,2020-05-06T17:26:05Z,2020-05-06T17:26:05Z,OWNER,"Some demos:
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_database_list%28%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_foreign_key_list%28%27complex_foreign_keys%27%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_function_list%28%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_index_info%28%27idx_compound_three_primary_keys_content%27%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_index_list%28%27compound_three_primary_keys%27%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_index_xinfo%28%27idx_compound_three_primary_keys_content%27%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_page_count%28%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_max_page_count%28%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_page_size%28%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_schema_version%28%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_table_info%28%27complex_foreign_keys%27%29
* https://latest.datasette.io/fixtures?sql=select+*+from+pragma_table_xinfo%28%27complex_foreign_keys%27%29","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,
https://github.com/simonw/datasette/issues/761#issuecomment-624774928,https://api.github.com/repos/simonw/datasette/issues/761,624774928,MDEyOklzc3VlQ29tbWVudDYyNDc3NDkyOA==,9599,simonw,2020-05-06T17:11:15Z,2020-05-06T17:11:15Z,OWNER,"For the moment I'll allow-list the following:
* `pragma_database_list`
* `pragma_foreign_key_list`
* `pragma_function_list`
* `pragma_index_info`
* `pragma_index_list`
* `pragma_index_xinfo`
* `pragma_page_count`
* `pragma_max_page_count`
* `pragma_page_size`
* `pragma_schema_version`
* `pragma_table_info`
* `pragma_table_xinfo`
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,
https://github.com/simonw/datasette/issues/761#issuecomment-624766424,https://api.github.com/repos/simonw/datasette/issues/761,624766424,MDEyOklzc3VlQ29tbWVudDYyNDc2NjQyNA==,9599,simonw,2020-05-06T16:54:38Z,2020-05-06T17:01:02Z,OWNER,"I could allow-list some other useful `pragma_x` tables too.

SQLite calls these ""pragma functions"" - documented here: https://www.sqlite.org/pragma.html#pragfunc

They sound safe:

>  Table-valued functions exist only for PRAGMAs that return results and that have no side-effects. ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,
https://github.com/simonw/datasette/issues/761#issuecomment-624768744,https://api.github.com/repos/simonw/datasette/issues/761,624768744,MDEyOklzc3VlQ29tbWVudDYyNDc2ODc0NA==,9599,simonw,2020-05-06T16:59:01Z,2020-05-06T16:59:01Z,OWNER,"Maybe use a negative lookahead assertion? https://docs.python.org/3/library/re.html#index-20

> `(?!...)`
> 
> Matches if `...` doesn’t match next. This is a negative lookahead assertion. For example, `Isaac (?!Asimov)` will match 'Isaac ' only if it’s not followed by 'Asimov'.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,
https://github.com/simonw/datasette/issues/761#issuecomment-624767466,https://api.github.com/repos/simonw/datasette/issues/761,624767466,MDEyOklzc3VlQ29tbWVudDYyNDc2NzQ2Ng==,9599,simonw,2020-05-06T16:56:40Z,2020-05-06T16:57:03Z,OWNER,"The rationale for blocking `pragma` entirely from statements is that it can be used to change the state of the SQLite database, e.g. from https://www.sqlite.org/pragma.html :

```
PRAGMA schema.application_id;
PRAGMA schema.application_id = integer ;
```
That second line is unsafe. I don't think it's possible to use the `pragma_table_x` variants to make writes in this way.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",613467382,Allow-list pragma_table_info(tablename) and similar,