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  my $stmt = new SQL::Fragment("SELECT *, PRICE+? FROM ITEMS", $fees);

...
  }

  my ($sql, @params) = $stmt->sql_and_params;

sub append - append another SQL Fragment to $self
sub append_join - append a join-ed list of SQL Fragments to $self
...
  join( $sep, map { "($_)" } @list )

For instance, this is useful to ensure each condition is in it's own s
+et of parens.

 sub append_join_parens {
   my $self = shift;
...
   });
   $self;
 }