获得减少或增加的工作时间

Question

我需要从员工列表中获取过去 12 个月与当前月份相比减少或增加的工作时间、首发人员和离职人员。

我遇到的问题是我没有得到上个月的离职人员，但本月的工作时间为空，即所谓的离职人员。

这是我尝试过的：

WITH CURRENTbase AS
(
    SELECT Employee, Work_hrs,monthdate
    FROM MyTable
    WHERE monthlydate >= '2020-mar-01'
),
PREVIOUSbase AS
(
    SELECT Employee, Work_hrs,monthdate
    DATEADD(MONTH,1,monthdate) monthdate
    FROM MyTable
    WHERE  monthdate >= '2020-mar-01'
)
SELECT 
    B.*, A.*,
    A.monthdate,
    ISNULL(B.Work_hrs,0) PreviousHRS,
    ISNULL(A.Work_hrs,0) CurrentHRS,
    CASE 
        WHEN b.Work_hrs is null THEN 'Starter'
        WHEN a.Work_hrs is null THEN 'Leaver'
        WHEN a.Work_hrs > b.Work_hrs THEN 'hrs_Increase'
        WHEN b.Work_hrs > a.Work_hrs THEN 'hrs_Decrease'
        WHEN b.Work_hrs = a.Work_hrs THEN 'NoChange'
        ELSE 'Check'
    END Status
FROM CURRENTbase A

LEFT JOIN PREVIOUSbase B 
    ON A.Employee = B.Employee AND A.monthdate = B.monthdate

WHERE a.CensusDate >= '2020-apr-01'

GROUP BY
    A.monthdate,
    ISNULL(B.Work_hrs,0) PreviousHRS,
    ISNULL(A.Work_hrs,0) CurrentHRS,
    CASE 
        WHEN b.Work_hrs is null THEN 'Starter'
        WHEN a.Work_hrs is null THEN 'Leaver'
        WHEN a.Work_hrs > b.Work_hrs THEN 'hrs_Increase'
        WHEN b.Work_hrs > a.Work_hrs THEN 'hrs_Decrease'
        WHEN b.Work_hrs = a.Work_hrs THEN 'NoCHange'
        ELSE 'check'
    END

Answer 1

如果您使用 MS SQL SERVER 2012 或更高版本，您可以尝试此查询，采用order by 以满足您的需求

SELECT *
  ,CASE 
      WHEN LEAD(WORKING_HOURS) OVER (
              PARTITION BY Employee ORDER BY Year DESC
                  ,Month DESC
              ) IS NULL
          THEN 'Starter'
      WHEN LEAD(WORKING_HOURS) OVER (
            PARTITION BY Employee ORDER BY Year ASC
                ,Month ASC
            ) IS NULL
        THEN 'Leaver'
      WHEN LEAD(WORKING_HOURS) OVER (
            PARTITION BY Employee ORDER BY Year ASC
                ,Month ASC
            ) > LEAD(WORKING_HOURS) OVER (
            PARTITION BY Employee ORDER BY Year DESC
                ,Month DESC
            )
        THEN 'hrs_Increase'
      WHEN LEAD(WORKING_HOURS) OVER (
            PARTITION BY Employee ORDER BY Year DESC
                ,Month DESC
            ) > LEAD(WORKING_HOURS) OVER (
            PARTITION BY Employee ORDER BY Year ASC
                ,Month ASC
            )
        THEN 'hrs_Decrease'
      WHEN LEAD(WORKING_HOURS) OVER (
            PARTITION BY Employee ORDER BY Year DESC
                ,Month DESC
            ) = LEAD(WORKING_HOURS) OVER (
            PARTITION BY Employee ORDER BY Year ASC
                ,Month ASC
            )
        THEN 'NoCHange'
      ELSE 'check'
      END
 FROM (
     SELECT Employee
        ,MONTH(monthdate) Month
        ,YEAR(monthdate) Year
        ,SUM(Work_hrs) AS WORKING_HOURS
    FROM MyTable
    GROUP BY Employee
       ,MONTH(monthdate)
       ,YEAR(monthdate)
  ) a