How'd you handle the NULL's? I was about to say that options include converting the NULL's to 0's in your pre-processing step (maybe something like s/,(?=,)/,0/g, but doesn't work for last col) .. or you could run a bunch of "UPDATE results SET colname = 0 WHERE colname = ''" statements .. both of those, of course assume you want them treated as 0's and not as NULL's (will greatly affect the AVG value).

As for output, perhaps something like this (depends on what you need in terms of cols) (note change in $dbh method used): 
my @avgs  = $dbh->selectrow_array($avgSQL);
print join(",", @cols) . "\n";
print join(",", @avgs) . "\n";

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In reply to Re^9: Database processing by davidrw
in thread DBI::st=HASH output by DrAxeman

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