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These nodes all have stuff by esilva (showing 1-2 out of ~2?):

Node ID Writeup Created
83353 Re: Re: when does version != version? 2001-05-25 21:01
83000 when does version != version? 2001-05-24 20:55
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[Corion]: Hmmm. I feel a Meditation coming on. I wrote a module, DBIx::PivotQuery, which returns a table-like set of rows (AoA) but some columns are generated from column values, like in an (Excel) pivot table or a ROLLUP command
[Corion]: My current approach for subtotals involves rerunning the given query, with the hint to the user that they should use a temporary table if they want better performance.
[Corion]: But I could create that temporary table in the module and use it for the improved perfomance directly instead.
[Corion]: And the question is, what would be better/preferred ;-)
[Corion]: Hmm - not exactly like the ROLLUP command. Ah well.

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