code: function(z_query) {
  			
  			// hash query
  			if(typeof z_query == 'object') {
  				return query_hash(z_query);
  			}
  			// string
  			else if(typeof z_query == 'string') {
  
  				if(z_query[0] == ':' || z_query[0] == '?') {
  					return qb({
  						select: '',
  						where: '\n'+z_query,
  						tail: '',
  						group: '',
  						order: '',
  						limit: '',
  					});
  				}
  
  				return query_string(z_query);
  			}
  		}
docs: public operator() ();