这两句SQL语句的执行结果是一样的不知道怎么回事

数据库：mysql5.0



select pid from cdb_posts limit 0,10;
+-----+
| pid |
+-----+
| 6 |
| 7 |
| 8 |
| 9 |
| 10 |
| 11 |
| 12 |
| 13 |
| 101 |
| 102 |
+-----+

select pid from cdb_posts limit 5,10;
+-----+
| pid |
+-----+
| 6 |
| 7 |
| 8 |
| 9 |
| 10 |
| 11 |
| 12 |
| 13 |
| 101 |
| 102 |
+-----+

不知道何故
如何解决！