查询不同字段的3个SQL语句及对应的结果：
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！
