如何使用三個表編寫這個複雜的MySQL查詢？

任務表 - TASK_ID，ACTIVITY_ID（外鍵），日期，結束日期
活動表 - ACTIVITY_ID，milestone_id（外鍵），other_fields
里程碑表 - milestone_id，PROJECT_ID，other_fields

現在我想結果S et像這樣

No_of_task(count) | no_activity | milestone_name 
     5   :  2  : ABC Milestone

我想統計end_dated任務，根據end_date任務和里程碑名稱計數活動。

例如，1里程碑，有5個活動，20個不同的任務名稱Housing_Construction ...一些任務end_dated所以

5任務結束這樣housing_construction的3活性。

任務表的說明

+-----------------------+-------------+------+-----+---------+----------------+ 
| Field     | Type  | Null | Key | Default | Extra   | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| activity_task_id  | int(11)  | NO | PRI | NULL | auto_increment | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| milestone_activity_id | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| task     | varchar(50) | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| description   | text  | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| assign_to_employee_id | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| assign_date   | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| task_end_date   | date  | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| tasktime    | varchar(50) | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| status    | tinyint(1) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| is_delete    | tinyint(1) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| entry_employee_id  | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| edit_employee_id  | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| createddatetime  | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| modifydatetime  | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| nooftimesedit   | smallint(6) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| completion_date  | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+

ActivityTable描述

+-----------------------+-------------+------+-----+---------+----------------+ 
| Field     | Type  | Null | Key | Default | Extra   | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| milestone_activity_id | int(11)  | NO | PRI | NULL | auto_increment | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| project_milestone_id | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| activityname   | varchar(50) | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| activity_end_date  | date  | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| activity_description | text  | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| status    | tinyint(1) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| is_delete    | tinyint(1) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| entry_employee_id  | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| edit_employee_id  | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| createddatetime  | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| modifydatetime  | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| nooftimesedit   | smallint(6) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+

表裏程碑描述

+-----------------------+-------------+------+-----+---------+----------------+ 
| Field     | Type  | Null | Key | Default | Extra   | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| project_milestone_id | int(11)  | NO | PRI | NULL | auto_increment | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| project_id   | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| milestone    | varchar(50) | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| milestone_description | text  | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| milestone_end_date | date  | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| status    | tinyint(1) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| is_delete    | tinyint(1) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| entry_employee_id  | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| edit_employee_id  | int(11)  | YES | MUL | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| createddatetime  | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| modifydatetime  | datetime | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| nooftimesedit   | smallint(6) | YES |  | 0  |    | 
+-----------------------+-------------+------+-----+---------+----------------+ 
| noofdays    | int(11)  | YES |  | NULL |    | 
+-----------------------+-------------+------+-----+---------+----------------+

來源

2016-12-27 Hardik

試試這個：

select 
    count(distinct t.activity_task_id) No_of_task, 
    count(distinct a.milestone_activity_id) no_activity, 
    m.milestone_description milestone_name 
from milestone m 
inner join activity a 
    on m.project_milestone_id = a.project_milestone_id 
inner join task t 
    on a.milestone_activity_id = t.milestone_activity_id 
where t.status != 4 
and t.task_end_date < curdate() 
group by m.project_milestone_id, 
    m.milestone_description;

來源

2016-12-27 05:31:54 GurV

感謝評論，但放在哪裏結束日期條件在此查詢？ – Hardik

select t.count as No_of_task from （SELECT COUNT（activity_task_id）count from activity_task_details where status！= 4 and task_end_date Hardik

@hardik請參閱已更新的答案't.end_date' – GurV

可以使用JOIN爲了這個目的，使用此下面的代碼，

SELECT COUNT(T.task_id) as no_of_task, 
     COUNT(A.activity_id) as no_of_activity, 
     MAX(M.milestone_name) as milestone_name 
FROM milestone M 
INNER JOIN activity A on M.milestone_id=A.milestone_id 
INNER JOIN task T on T.activity_id =A.activity_id 
GROUP BY A.activity_id,T.task_id 
HAVING T.end_date < curdate()

來源

2016-12-27 05:32:02

謝謝你的回覆，我會試試這個，但是在哪裏可以放置過時的任務？在任務開始日期和結束日期中有兩個字段，我需要在'GROUP BY'之後結束 – Hardik

的任務計數，您可以像這樣放置'HAVING [value1] = 1' –

select t.count as No_of_task from （ SELECT COUNT（activity_task_id）count from activity_task_details where status！= 4 and task_end_date Hardik

如何使用三個表編寫這個複雜的MySQL查詢？

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