请帮我这个查询

-1

emp_detail 
---------------------------------------------------------------------- 
emp_number(int)| emp_id(int) | emp_name(varchar) | joined_date (date) 
----------------------------------------------------------------------

和

---------------------------------------------------------------------- 
emp_termination 
---------------------------------------------------------------------- 
emp_number(int)foreign key| termination_reason(varchar) | termination_date (date) 
----------------------------------------------------------------------

我要为一年的员工数量谁在每月左或加入了该公司每月记录像这样：

----------------------- 
month | joined | left 
-----------------------

来源

2014-10-09 Swapnil1988

你可以添加样本数据吗？ – Jens 2014-10-09 05:58:08

请大家帮忙，包括你自己，并请阅读http://meta.stackexchange.com/questions/10647/how-do-i-write-a-good-title谢谢！ – reto 2014-10-09 05:59:50

是的牛仔裤像int值将像1,2,3 ...，varchar将是简单的字符串日期格式为'01 -02-2014'我想要加入和离开（终止）在几个月告诉我你是否需要进一步的信息和谢谢回复 – Swapnil1988 2014-10-09 06:06:16

使用UNION ALL加入并离开两行员工，然后按月组合t o离开并加入一行。

SELECT year, month, SUM(joined), SUM(left) 
FROM 
    (SELECT YEAR(ed.joined_date) AS year, MONTH(ed.joined_date) AS month, COUNT(MONTH(ed.joined_date)) AS joined, 0 AS left 
    FROM emp_detail AS ed 
    GROUP BY YEAR(ed.joined_date), MONTH(ed.joined_date) 
    UNION ALL 
    SELECT YEAR(ed.termination_date) AS year, MONTH(ed.termination_date) AS month, COUNT(MONTH(et.termination_date)) AS left, 0 AS joined 
    FROM emp_termination AS et 
    GROUP BY YEAR(ed.termination_date), MONTH(et.termination_date)) AS my_table 
GROUP BY year, month

来源

2014-10-09 06:15:18

@swapnil：请让我知道是否有帮助 – 2014-10-09 06:28:29

雅谢谢你的作品... – Swapnil1988 2014-10-09 06:30:38

酷，请让我知道如果有些事不清楚。 – 2014-10-09 06:31:41

试试这个..

select table1.monthname, table1.Joined, table2.LeftCop from 
(
select year(joined_date) year 
     , MONTHNAME(STR_TO_DATE(month(joined_date) , '%m')) as monthname 
     ,count(*) as Joined 
     ,0 as LeftCop 
     from emp_detail 
    group by month(joined_date) , year(joined_date) 

) Table1 

join 

(
select year(termination_date) year 
     , MONTHNAME(STR_TO_DATE(month(termination_date) , '%m')) as monthname 
     ,0 as Joined 
     ,count(*) as LeftCop 
     from emp_termination 
    group by month(termination_date) , year(termination_date) 
) table2 

on table1.year = table2.year and table1.monthname = table2.monthname

来源

2014-10-09 06:25:48 NMK

请帮我这个查询

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