%fetch= (sse_date => 4934056723, bld_num => 7.3.998.0.0,
        sse_date => 4934099999, bld_num => 7.3.1003.0.0,
        sse_date => 4949999999, bld_num => 7.3.1089.0.0);

##</code><code>##

my @fetch = ({sse_date => 4934056723, bld_num => '7.3.998.0.0'},
             {sse_date => 4934099999, bld_num => '7.3.1003.0.0'},
             ...
            );

##</code><code>##

my @sorted = map { $_->{bld_num} } sort { $a->{sse_date} <=> $b->{sse_date} } @fetch;