Question

我有一个查询，列出了这些年来的员工评级，但这些年份都列在一列中。我试图让会议多年来拥有自己的分数列，如果他们没有得分则为空。

到目前为止的守则：

SELECT Employee_ID, Meeting_Year, Manager_Readiness_Rating
FROM  dbo.v_sc17_TMS_Data_Career_Meeting_Rating
GROUP BY Employee_ID, Meeting_Year, Manager_Readiness_Rating

因此，如果meeting_year是2012，我希望员工列中列出所有2012 Manager_Readiness_Rating。这是一些例子

ID    Year      Rating
1     2011  11 
2     2012  10 
3     2010  09
4     2010  03  
4     2011  03

我希望它看起来像

ID  2010   2011  2012
1    NULL   11    NULL
2    NULL   NULL  1
3    09    NULL    NULL
4    03    03    NULL

Answer 1

SELECT Employee_ID, Meeting_Year, GROUP_CONCAT(Manager_Readiness_Rating)
FROM dbo.v_sc17_TMS_Data_Career_Meeting_Rating
GROUP BY Employee_ID, Meeting_Year

Answer 2

这被标记为MySQL，但dbo让我认为它是SQL Server。此查询应适用于任何一个：

SELECT
  Employee_ID AS ID,
  MAX(CASE WHEN Year = 2010 THEN Rating END) AS R2010,
  MAX(CASE WHEN Year = 2011 THEN Rating END) AS R2011,
  MAX(CASE WHEN Year = 2012 THEN Rating END) AS R2012
FROM dbo.v_sc17_TMS_Data_Career_Meeting_Rating
GROUP BY Employee_ID
ORDER BY 1

适用于特定标准的情况

2 个答案: