我想在网站上添加一项调查.一项好的调查需要报告.一些基本报告已经完成.现在我想在咖啡上加点奶油......
包含样本数据的表格:
mysql> select * from u001;
+----+----------+------------+-------+---------------------+
| id | drink | sex | age | date |
+----+----------+------------+-------+---------------------+
| 1 | Beer | m | 30-39 | 2012-10-17 23:17:52 |
| 2 | Milk | f | 10-19 | 2012-10-18 00:15:59 |
| 3 | Milk | f | 20-29 | 2012-10-18 23:33:07 |
| 4 | Tea | m | 30-39 | 2012-10-20 22:47:08 |
| 5 | Water | f | 20-29 | 2012-10-20 22:47:30 | …mysql ×1