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#!/usr/bin/perl

...

$sth->finish();
$dbh->disconnect();

my $sth = $dbh->prepare("SELECT AVG(col3) FROM mydata.csv");

my $sth = $dbh->prepare("SELECT (col2 + col3) FROM mydata.csv");

my $sth = $dbh->prepare("SELECT AVG(col2 + col3) FROM mydata.csv");

col1,col2,col3,col4

...

481,435,225,0.6