简单查询：
select *
from data.staff AS staff
left join data.contact AS workphones on staff.id = workphones.staff_with_work_phone_id
Mysql运行时间：5.3秒 MariaDb运行时间：0.016秒
联系人有~50000行 工作人员有大约600行。
是什么原因？
是否有可能在mysql上实现相同的结果？
谢谢！
解释MySql（v5.7.14）：
+----+-------------+------------+------------+------+--------------------------------+------+---------+------+-------+----------+---------------------------------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+------------+------------+------+--------------------------------+------+---------+------+-------+----------+---------------------------------------+
| 1 | SIMPLE | staff | NULL | ALL | NULL | NULL | NULL | NULL | 606 | 100.00 | NULL |
+----+-------------+------------+------------+------+--------------------------------+------+---------+------+-------+----------+---------------------------------------+
| 2 | SIMPLE | workphones | NULL | ALL | FK_2f7824065c2c4b0fbe5c00da271 | NULL | NULL | NULL | 49180 | 100.00 | Using where. |
| | | | | | | | | | | | Using join buffer (Block Nested Loop) |
+----+-------------+------------+------------+------+--------------------------------+------+---------+------+-------+----------+---------------------------------------+
解释MariaDB（v10.0.28）：
+----+-------------+------------+------+--------------------------------+--------------------------------+---------+--------------------+-------+----------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+------------+------+--------------------------------+--------------------------------+---------+--------------------+-------+----------+-------+
| 1 | SIMPLE | staff | ALL | | | | | 602 | 100.00 | |
+----+-------------+------------+------+--------------------------------+--------------------------------+---------+--------------------+-------+----------+-------+
| 2 | SIMPLE | workphones | ALL | FK_1249f6bc1d68495090691f3ce02 | FK_1249f6bc1d68495090691f3ce02 | 9 | user_data.staff.id | 25476 | 100.00 | |
+----+-------------+------------+------+--------------------------------+--------------------------------+---------+--------------------+-------+----------+-------+
其余验证条件相同。 测试进行了多次。