Use named parameters:

#!/usr/bin/perl

use warnings;
use strict;

update_table(
    name    => 'test_name',
    phone   => 'test_phone',
    city    => 'test_city',
    country => 'test_country'
    );
update_table(
    name    => 'test_name',
    phone   => 'test_phone',
    country => 'test_country'
    );
update_table(name => 'test_name', city => 'test_city');


sub update_table {
    my (%params) = @_;

    die "name parameter is required by update_table ()\n"
        if !exists $params{name};

    my @fieldNames = grep {$_ ne 'name'} keys %params;
    my @fields = map {"$_ = *"} @fieldNames;
    my $sql = "UPDATE table SET ";
    my @values = (@params{@fieldNames}, $params{name});

    $sql .= join ', ', @fields;
    $sql .= " WHERE name = '*'";

    print "$sql [values are @values]\n";
    return 1;
}
[download]

Prints:

UPDATE table SET country = *, city = *, phone = * WHERE name = '*' [va
+lues are test_country test_city test_phone test_name]
UPDATE table SET country = *, phone = * WHERE name = '*' [values are t
+est_country test_phone test_name]
UPDATE table SET city = * WHERE name = '*' [values are test_city test_
+name]
[download]

Note too that this uses place holders which should always be used to avoid quoting issues (and injection attacks for untrusted data sources).

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