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Indeed - I'm not as familiar with binary, so I'll have to ponder a bit, but thanks! I was working on this problem and was working on an algorithm that would iterate through all combos, but the checking back to see if you were REALLY done once you had reached the end of a set was killer for large sets (e.g. 30)...

In reply to Re: (tye)Re2: Finding all Combinations by redbeard
in thread Finding all Combinations by narse

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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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