mysql - 对此可以优化的查询是什么？

Question

我陷入了小查询。有一个名为 Table_Activities 的表。

Table_Activities(Act_id、Date、Activity_name、说明)。

我们需要据此生成一份报告。用户将从下拉列表中选择他想要生成报告的月和年。

我们需要按事件名称显示该月和该年组的所有事件。

示例 - 用户选择六月和2012。

报告将是-

园艺

01/06/2012 - They have planted 100 trees.
14/06/2012 - something
27/06/2012 - something

培训

02/06/2012 - Detail description
15/06/2012 - something
28/06/2012 - something

我的问题是用什么mysql查询来获取这种格式的数据？

Answer 1

select `Date`,description from tm_activities 
where month(`Date`)='6' and year(`Date`)='2012' 
order by Activity_name,`date` 

要返回问题中所示的确切格式，请尝试以下操作:

select concat(if(actdate='',activity_name,date_format(actdate,'%d/%m/%y')),if(description<>'',concat(' - ',description),'')) as labelm from
(
(select ActDate,description,activity_name from tm_activities where month(ActDate)='6' and year(ActDate)='2012' 
) 
union all
(Select distinct '','',activity_name from tm_activities where month(ActDate)='6' and year(ActDate)='2012')
)m order by activity_name,actdate
;

SQL FIDDLE HERE.

输出如下:

Gardening
01/06/12 - They have planted 100 trees.
27/06/12 - Gar 2
Training
12/06/12 - Training 1
28/06/12 - Traning 2
30/06/12 - Traning 3