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create table Names (
   the_key    int PRIMARY KEY,
   last_name  varchar(32),
   first_name varchar(32)
)

# Setup code
my $SortField = 'last_name'; # could be 'first_name'
...
.         "ORDER BY $SortField "
.         "LIMIT    $PageSize ";
my $results = $db->selectall_arrayref($SQL);