my $query = $dbh->prepare('SHOW TABLES');
    if (defined($query)) {
        $query->execute();
        my @row;
        while (@row = $query->fetchrow_array()) {
                    $sql = qq|delete from $row[0]|;
            $sth = $dbh->prepare($sql) 
                    or die "Cannot prepare: " .  
                    $dbh->errstr();
            $sth->execute() or die "" . $sth->errstr();
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