issues: 811505638

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association pull_request body repo type active_lock_reason performed_via_github_app
811505638 MDU6SXNzdWU4MTE1MDU2Mzg= 1234 Runtime support for ATTACHing multiple databases 9599 open 0     1 2021-02-18T22:06:47Z 2021-02-22T21:06:28Z   OWNER  

The implementation in #1232 is ready to land. It's the simplest-thing-that-could-possibly-work: you can run datasette one.db two.db three.db --crossdb and then use the /_memory page to run joins across tables from multiple databases.

It only works on the first 10 databases that were passed to the command-line. This means that if you have a Datasette instance with hundreds of attached databases (see Datasette Library) this won't be particularly useful for you.

So... a better, future version of this feature would be one that lets you join across databases on command - maybe by hitting /_memory?attach=db1&attach=db2 to get a special connection.

_Originally posted by @simonw in https://github.com/simonw/datasette/issues/283#issuecomment-781665560_

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