If the ids are in another table (eg table_id) then you could use a join (inner) to filter the results. Here's an example using SQL::Abstract::More

#!perl
use strict;
use DBIx::Simple;
use SQL::Abstract::More;

my $dbh = '....'; # connect
$dbh->abstract = SQL::Abstract::More->new();
my @ww = qw/a b c/;

my @data = $dbh->select(
  -from    => [ -join => qw/table id=id table_id/],
  -columns => ['part'],    
  -where => { 
      ww   => {-in       => [@ww] },
      part => {-not_like => '0000000%'} },
  -union => [ 
    -columns => ['n'],    
    -where   => { 
      ww   => {-in   => [@ww] },
      part => {-like => '0000000%'} }
  ],
  -group_by => ['part'],
)->flat;

print 'The uin count is '.scalar @data."\n";
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