MySQL - Defina um nome de coluna para o ID na criação?

SHOW TABLE STATUS FROM tablename LIKE Auto_increment
/*or*/
SELECT `auto_increment` FROM `INFORMATION_SCHEMA.TABLES` WHERE table_name = 'tablename'

DELIMITER $$

CREATE TRIGGER bi_table1_each BEFORE INSERT ON table1 FOR EACH ROW
BEGIN
  DECLARE next_id integer;
  SELECT `auto-increment` FROM `INFORMATION_SCHEMA.TABLES` INTO Next_id 
  WHERE TABLE_NAME = 'table1' LIMIT 1;     
  SET new.sortcolumn = next_id;
END $$

DELIMITER ;