*
		 * @since 4.5.1
		 *
		 * @param string              $select_columns Columns to select.
		 * @param LLMS_Database_Query $db_query       Instance of LLMS_Database_Query.
		 */
		return apply_filters( "llms_{$this->id}_query_select_columns", $select_columns, $this );
	}

	/**
	 * Retrieve the prepared SQL for the LIMIT clause.
	 *
	 * @since 3.16.0
	 * @since 4.5.1 Drop use of `$this->get_filter('limit')` in favor of `"llms_{$this->id}_query_limit"`.
	 * @since 10.0.0 Returns empty string for count_only queries.
	 *
	 * @return string
	 */