So "best" means fastest?

We don't know how big your table is and if memory is an issue.

In programming you can almost always trade memory with time!

... like pulling n big chunks of the table in sliding windows.

For instance I suppose (see your footnote) two SQL queries for ID and SN are faster but your map solution occupies less memory ( the second level hash refs are reused scalars)

So .... It really depends...

> * I should probably benchmark that

That's a bingo! ;)

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^4: Too Many IDs by LanX
in thread Too Many IDs by The_Dj

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