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我有一个如下所示的员工数据集。开始日期是雇员的入职日期，结束日期是雇员离开雇主的日期。两者都是日期数据类型。

Gender   StartDate       EndDate
 M       2010-04-30      2013-06-18
 F       2010-01-09      2015-06-19
 M       2009-09-08      2014-08-13

我想根据平均就业月数将员工数据分成四分位数。结果还包括员工总数（员工列）、男性员工百分比、女性员工百分比以及平均受雇月数。请在下面找到预期的结果：

Quartile    Employee    %Male   %Female   AvgMonths
1             20        60.00    40.00     8.75
2             25        50.00    50.00     28.5
3             10        40.00    60.00     41.25

我想根据受雇月数获得 25%、50% 和 75% 四分位数，并取平均值以获得 AvgMONths。

请在下面找到我的查询，我不知道在哪里可以将四分位数计算添加到查询中。

declare @current date;
set @current='2012-12-31';

select count(*) as Employees,
       cast(cast(AVG(CASE WHEN Gender = 'M' THEN 1.0 ELSE 0 END)*100 as decimal(18,2)) as nvarchar(5)) +'%' as Male,
       cast(cast(AVG(CASE WHEN Gender = 'F' THEN 1.0 ELSE 0 END)*100 as decimal(18,2)) as nvarchar(5)) +'%' as Female,
       AVG(CASE WHEN EndDate is null then DATEDIFF(MONTH, StartDate, @current)
                when EndDate is not null then DATEDIFF(MONTH, StartDate, EndDate)
           end) as AvgMonths
from dbo.DimEmployee

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我自己想通了。请在下面找到代码：

declare @current date;
set @current='2012-12-31';
select count(*) as Employees,
       cast(cast(AVG(CASE WHEN Gender = 'M' THEN 1.0 ELSE 0 END)*100 as decimal(18,2)) as nvarchar(10)) +'%' as Male,
       cast(cast(AVG(CASE WHEN Gender = 'F' THEN 1.0 ELSE 0 END)*100 as decimal(18,2)) as nvarchar(10)) +'%' as Female,
       AVG(t.EmployedMonths) as AvgMonths,
       Ntile(3) over (order by t.EmployedMonths asc) as Quartiles
from
      (select EmployeeKey, Gender,
       CASE WHEN EndDate is null then abs(DATEDIFF(MONTH, StartDate, @current))
            when EndDate is not null then abs(DATEDIFF(MONTH, StartDate, EndDate))
            end as EmployedMonths
        from dbo.DimEmployee)t
group by t.EmployedMonths
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1 回答 1

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rank()您可以使用和count(*)作为窗口函数来计算四分位数：

select floor( rnk * 4.0 / cnt ) as quartile,
       count(*) as Employees,
       cast(cast(AVG(CASE WHEN Gender = 'M' THEN 1.0 ELSE 0 END)*100 as decimal(18,2)) as nvarchar(5)) + '%' as Male,
       cast(cast(AVG(CASE WHEN Gender = 'F' THEN 1.0 ELSE 0 END)*100 as decimal(18,2)) as nvarchar(5)) + '%' as Female,
       AVG(num_months * 1.0) as AvgMonths
from (select e.*,
             rank() over (partition by datediff(month, startdate, coalesce(enddate, @current))) - 1 as rnk,
             count(*) over () as cnt,
             datediff(month, startdate, coalesce(enddate, @current)) as num_months
      from dbo.DimEmployee e
     ) e
group by floor( rnk * 4.0 / cnt )
于 2020-02-03T23:01:37.277 回答