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5 changes: 5 additions & 0 deletions book/src/super-sql/operators/from.md
Original file line number Diff line number Diff line change
Expand Up @@ -163,6 +163,11 @@ is a pool.
Data sources identified by URLs can be accessed either when attached
or detached from a database.

>[!NOTE]
> A URL computed at run time from a [non-constant f-string](../expressions/f-strings.md)
> cannot currently be accessed while attached to a database, and fails with an
> error of the form `<url>: cannot open in a database environment`.

As a [text entity](../queries.md#text-entity), typical URLs need not be quoted though URLs with special characters must be quoted.

When the `<entity>` argument begins with `http:` or `https:`
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