issue_comments: 696976678

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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/42#issuecomment-696976678 https://api.github.com/repos/simonw/sqlite-utils/issues/42 696976678 MDEyOklzc3VlQ29tbWVudDY5Njk3NjY3OA== 9599 2020-09-22T20:57:57Z 2020-09-22T20:57:57Z OWNER

I think I understand the shape of this feature now. It lets you specify one or more columns on the source table which will be extracted into another table. It uses the .lookup() mechanism to populate that other table, which means each unique column value / pair / triple will be assigned an integer ID.

That integer ID gets written back into the first of the columns that are being transformed. A .transform() call then converts that column to an integer (and drops the additional columns). Finally we set up the new foreign key relationship.

 
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