On Tue, Jul 1, 2014 at 10:13 PM, MRAB <pyt...@mrabarnett.plus.com> wrote:
> Anyway, I'm sure there's something in SQL for "insert or update" or "on
> duplicate", but that's an SQL question, not a Python question.

Not in standard SQL, no; there might be in SQLite, as a non-standard
extension, but it's a fundamentally hard problem and it has issues.
Frankly, though, I doubt the time cost of set operations is anything
significant compared to the various queries against the database.


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