order by 用于对查询出来的数据进行排序操作，用两个例子可以很容易理解这个参数。
#1，普通查询。
mysql> select * from groups;+----+---------------------+---------------------+---------------------+----------+------------+| id | created_at | updated_at | deleted_at | group_id | group_name |+----+---------------------+---------------------+---------------------+----------+------------+| 1 | NULL | 2020-06-16 22:07:02 | 2020-06-16 22:14:40 | 1 | 开发组 || 2 | 2020-06-15 23:37:25 | 2020-06-15 23:37:25 | NULL | 2 | 测试组 || 3 | 2020-06-16 22:17:07 | 2020-06-16 22:17:07 | NULL | 3 | 运营组 || 4 | 2020-06-16 22:17:15 | 2020-06-16 22:17:15 | NULL | 4 | 客服组 || 5 | 2020-06-16 22:17:26 | 2020-06-16 22:17:26 | NULL | 5 | OPS |+----+---------------------+---------------------+---------------------+----------+------------+5 rows in set (0.00 sec)
默认情况下，查出来的数据是按照主键 ID 正序排列的。2，基于 ID 进行排序。
mysql> select * from groups order by id desc;+----+---------------------+---------------------+---------------------+----------+------------+| id | created_at | updated_at | deleted_at | group_id | group_name |+----+---------------------+---------------------+---------------------+----------+------------+| 5 | 2020-06-16 22:17:26 | 2020-06-16 22:17:26 | NULL | 5 | OPS || 4 | 2020-06-16 22:17:15 | 2020-06-16 22:17:15 | NULL | 4 | 客服组 || 3 | 2020-06-16 22:17:07 | 2020-06-16 22:17:07 | NULL | 3 | 运营组 || 2 | 2020-06-15 23:37:25 | 2020-06-15 23:37:25 | NULL | 2 | 测试组 || 1 | NULL | 2020-06-16 22:07:02 | 2020-06-16 22:14:40 | 1 | 开发组 |+----+---------------------+---------------------+---------------------+----------+------------+5 rows in set (0.00 sec)
注意其中的 desc表示用倒序排列。
如果想要正序排列，则使用asc:
mysql> select * from groups order by id asc;+----+---------------------+---------------------+---------------------+----------+------------+| id | created_at | updated_at | deleted_at | group_id | group_name |+----+---------------------+---------------------+---------------------+----------+------------+| 1 | NULL | 2020-06-16 22:07:02 | 2020-06-16 22:14:40 | 1 | 开发组 || 2 | 2020-06-15 23:37:25 | 2020-06-15 23:37:25 | NULL | 2 | 测试组 || 3 | 2020-06-16 22:17:07 | 2020-06-16 22:17:07 | NULL | 3 | 运营组 || 4 | 2020-06-16 22:17:15 | 2020-06-16 22:17:15 | NULL | 4 | 客服组 || 5 | 2020-06-16 22:17:26 | 2020-06-16 22:17:26 | NULL | 5 | OPS |+----+---------------------+---------------------+---------------------+----------+------------+5 rows in set (0.00 sec)
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