> On Oct 15, 2016, at 11:12 AM, Keith Medcalf <[email protected]> wrote:
>
>> Is there a way to do this automagically (like a specialized INSERT
>> command?) in Sqlite?
>
> Unfortunately no, there is no way to do this on *ANY* database that uses the
> relational database model.
There’s no need to dive into database theory! I’ll play devil’s advocate and
say that this could pretty easily be done in SQLite by writing a simple
extension function like in inbetween(a, b) that takes two strings and returns a
string that sorts in between them, as I described previously.
Then you just make the table’s primary key a string and do
INSERT INTO mytable (ID, …) VALUES (inbetween($firstid, $secondid), …)
where $firstid and $secondid are the the primary keys of the two rows you want
to insert between.
In real life you’d probably just implement inbetween() as part of your program
instead of as a SQLite function; I just wanted to prove that a relational
database can in fact do this.
—Jens
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