mysql 不使用 Order by using DESC 进行排序

Question

在ubuntu上使用mysql

下面的命令不是降序

mysql> select spo_id, count(spo_id) as "maxCount" from order_details GROUP BY spo_id ORDER BY "maxCount" DESC;
+--------+----------+
| spo_id | maxCount |
+--------+----------+
|      1 |        1 |
|      2 |        3 |
|      3 |        1 |
+--------+----------+
3 rows in set (0.00 sec)

Answer 1

MySQL 允许带双引号的字符串文字。因此，当您按“maxCount”排序时，您实际上是按字符串文字排序，这是毫无意义的。删除引号，它应该可以正常工作:

MariaDB [db]> select spo_id, count(spo_id) as maxCount from order_details GROUP BY spo_id ORDER BY maxCount DESC;
+--------+----------+
| spo_id | maxCount |
+--------+----------+
|      2 |        3 |
|      3 |        1 |
|      1 |        1 |
+--------+----------+
3 rows in set (0.00 sec)