mysql的默认排序规则探讨

3个SQL语句的不同结果（注意sid的值）：

 

mysql>  select sid,order_no,order_status from oms_order   limit 10;
+ -----+----------------+--------------+
| sid | order_no       | order_status |
+ -----+----------------+--------------+
|  20 | 20100319000003 |            0 |
|  21 | 20100319000004 |            0 |
|  63 | 20100319000046 |           -1 |
|  69 | 20100320000006 |            0 |
|  76 | 20100323000001 |            0 |
|  77 | 20100323000002 |            0 |
|  78 | 20100323000003 |            0 |
|  79 | 20100323000004 |            8 |
|  86 | 20100324000007 |           -1 |
|  93 | 20100324000014 |           -1 |
+ -----+----------------+--------------+
10  rows  in  set  (0.00 sec)

mysql>  select sid,order_status from oms_order   limit 10;
+ -----+--------------+
| sid | order_status |
+ -----+--------------+
| 240 |           -1 |
| 261 |           -1 |
| 263 |           -1 |
| 285 |           -1 |
| 286 |           -1 |
| 288 |           -1 |
| 339 |           -1 |
| 383 |           -1 |
| 387 |           -1 |
| 452 |           -1 |
+ -----+--------------+
10  rows  in  set  (0.00 sec)

mysql>  select sid from oms_order   limit 10;
+ ---------+
| sid     |
+ ---------+
| 1171641 |
| 1171651 |
| 1171661 |
| 1171671 |
| 1171681 |
| 1171691 |
| 1171701 |
|      20 |
|      21 |
|      63 |
+ ---------+
10  rows  in  set  (0.00 sec)

排序规则：


以上信息整理与互联网，笔者本人还没完全搞懂，大家可以探讨！