Shane Dev wrote:
Hi Clemens,
Your query is much faster on my system - thanks!
Apart from visual inspection and testing, is there anyway to be sure
your
query selects the same results as my query?
From https://sqlite.org/queryplanner.html "When programming in SQL
you tell
the system what you want to compute, not how to compute it". Is this
an
exception to the rule where the query planner must be told how to
compute
the result?
select * from nodes where not exists (select * from edges where
child=nodes.id);
select * from nodes where not exists (select 1 from edges where
child=nodes.id);
select * from nodes where id not in (select child from edges);
The first two queries look more 'procedural' than the last. So this
may confirm "When programming in SQL you tell the system what you want
to compute, not how to compute it"
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