巧用rand（）提取隨機行
mysql> select * from category order by rand();mysql
mysql> select * from category order by rand() limit 5 ;sql
+-------------+-------------+---------------------+ide
| category_id | name | last_update |it
+-------------+-------------+---------------------+io
| 6 | Documentary | 2006-02-15 04:46:27 |ast
| 1 | Action | 2006-02-15 04:46:27 |class
| 13 | New | 2006-02-15 04:46:27 |date
| 2 | Animation | 2006-02-15 04:46:27 |select
| 11 | Horror | 2006-02-15 04:46:27 |im
+-------------+-------------+---------------------+
5 rows in set (0.00 sec)
mysql> select * from category order by rand() limit 5 ;
+-------------+-----------+---------------------+
| category_id | name | last_update |
+-------------+-----------+---------------------+
| 16 | Travel | 2006-02-15 04:46:27 |
| 15 | Sports | 2006-02-15 04:46:27 |
| 13 | New | 2006-02-15 04:46:27 |
| 2 | Animation | 2006-02-15 04:46:27 |
| 7 | Drama | 2006-02-15 04:46:27 |
+-------------+-----------+---------------------+
5 rows in set (0.00 sec)
mysql>
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每一个你不满意的现在，都有一个你没有努力的曾经。