issue_comments: 699524671

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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

 
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