filter on a nested select.
select
id,
( select sum(i2.size)
from items i2
where i2.id <= i1.id
) sum_size
from items i1
where sum_size < 5;
I'm sure performance sucks :-) Something like this would be much faster to
do in a procedural language instead of in SQL.
HTH,
Sam
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-----Original Message-----
From: Steve Krulewitz [mailto:[EMAIL PROTECTED]
Sent: Monday, May 14, 2007 8:26 PM
To: sqlite-users@sqlite.org
Subject: [sqlite] Limit selection by rolling sum?
Hey all --
I have a table that I would like to select the first N records where
the rolling sum of a given column is less than some literal value.
SQL for this might look like:
select item_id from items where rolling_sum(item_size) < 10000 order
by item_name;
Is there a way to do this? Would sqlite know to stop processing the
query once the limit is reached? Manually doing the rolling sum while
reading the query result is not a good option for me as I am working
with an API on top of sqlite that does not allow this.
I am already using a custom collation sequence, so adding a custom
function would not be a problem :)
cheers,
-steve
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