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/179#issuecomment-699524671,https://api.github.com/repos/simonw/sqlite-utils/issues/179,699524671,MDEyOklzc3VlQ29tbWVudDY5OTUyNDY3MQ==,9599,2020-09-26T17:31:23Z,2020-09-27T20:31:50Z,OWNER,"SQL query for detecting integers:
```sql
select
  'contains_non_integer' as result
from
  mytable
where
  cast(cast(mycolumn AS INTEGER) AS TEXT) != mycolumn
limit
  1
```
This will return a single row with a 1 as soon as it comes across a column that contains a non-integer - so it short circuits quickly on TEXT columns with non-integers in them.

If everything in the column is an integer it will scan the whole thing before returning no rows.

More extensive demo:
```sql
select
  value,
  cast(cast(value AS INTEGER) AS TEXT) = value as is_valid_int
from
  (
    select
      '1' as value
    union
    select
      '1.1' as value
    union
    select
      'dog' as value
    union
    select
      null as value
  )
```
https://latest.datasette.io/fixtures?sql=select%0D%0A++value%2C%0D%0A++cast%28cast%28value+AS+INTEGER%29+AS+TEXT%29+%3D+value+as+is_valid_int%0D%0Afrom%0D%0A++%28%0D%0A++++select%0D%0A++++++%271%27+as+value%0D%0A++++union%0D%0A++++select%0D%0A++++++%271.1%27+as+value%0D%0A++++union%0D%0A++++select%0D%0A++++++%27dog%27+as+value%0D%0A++++union%0D%0A++++select%0D%0A++++++null+as+value%0D%0A++%29


value | is_valid_int
-- | --
  |  
1 | 1
1.1 | 0
dog | 0","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",709577625,
https://github.com/simonw/sqlite-utils/issues/179#issuecomment-699526149,https://api.github.com/repos/simonw/sqlite-utils/issues/179,699526149,MDEyOklzc3VlQ29tbWVudDY5OTUyNjE0OQ==,9599,2020-09-26T17:43:28Z,2020-09-26T17:43:28Z,OWNER,Posed a question about this on the SQLite forum here: https://sqlite.org/forum/forumpost/ab0dcd66ef,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",709577625,
https://github.com/simonw/sqlite-utils/issues/179#issuecomment-699684535,https://api.github.com/repos/simonw/sqlite-utils/issues/179,699684535,MDEyOklzc3VlQ29tbWVudDY5OTY4NDUzNQ==,9599,2020-09-27T20:30:31Z,2020-09-27T20:30:31Z,OWNER,"This recipe looks like it might be the way to detect floats:
```sql
select
  value,
  cast(cast(value AS REAL) AS TEXT) in (value, value || '.0') as is_valid_float
from
  (
    select
      '1' as value
    union
    select
      '1.1' as value
    union
    select
      'dog' as value
    union
    select
      null as value
  )
```
Demo: https://latest.datasette.io/fixtures?sql=select%0D%0A++value%2C%0D%0A++cast%28cast%28value+AS+REAL%29+AS+TEXT%29+in+%28value%2C+value+%7C%7C+%27.0%27%29+as+is_valid_float%0D%0Afrom%0D%0A++%28%0D%0A++++select%0D%0A++++++%271%27+as+value%0D%0A++++union%0D%0A++++select%0D%0A++++++%271.1%27+as+value%0D%0A++++union%0D%0A++++select%0D%0A++++++%27dog%27+as+value%0D%0A++++union%0D%0A++++select%0D%0A++++++null+as+value%0D%0A++%29


value | is_valid_float
-- | --
  |  
1 | 1
1.1 | 1
dog | 0","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",709577625,
https://github.com/simonw/sqlite-utils/issues/179#issuecomment-864349066,https://api.github.com/repos/simonw/sqlite-utils/issues/179,864349066,MDEyOklzc3VlQ29tbWVudDg2NDM0OTA2Ng==,9599,2021-06-19T03:36:04Z,2021-06-19T03:36:04Z,OWNER,This work is going to happen in #282.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",709577625,