列到逗号分隔值的分区由ID

Question

我具有SQL Server 2008表等

EmployeeCertificationHistoryId EmployeeCertificationID EmployeeID CertificationID CertificationDate 
1 244 2192 1 2/15/2006 
2 185 2058 87 4/10/2010 
3 245 2240 102 8/11/2013 
4 246 2249 104 11/23/2005 
5 247 2221 101 6/12/2013 
6 248 2238 84 NULL 
7 245 2240 102 8/11/2013 
8 249 2240 102 8/4/2013 
10 253 2175 84 6/19/2013 
11 254 2239 105 2/5/2011 
12 255 2239 111 11/22/2012 
9 96 1468 92 12/6/2010 
13 256 2239 110 11/22/2012 

我需要逗号单独certificationid每雇员。例如 。对于2239 => 105,111,110

我已经写了一个查询，但它给一个列中的所有证书ID。我的查询是

SELECT STUFF(
(SELECT ',' + CAST(C.CertificationID AS VARCHAR(100)) 
FROM tbl_PM_EmployeeCertificationMatrixHistory C 
ORDER BY c.CertificationID 
FOR XML PATH('')),1,1,'') AS CSV 
GO 

我只需要employeeid和certificationid.but但我无法整理出来。

Answer 1

你只需要雇员添加到查询以及一个WHERE和DISTINCT

SELECT DISTINCT A.EmployeeID, STUFF(
(SELECT ',' + CAST(C.CertificationID AS VARCHAR(100)) 
FROM tbl_PM_EmployeeCertificationMatrixHistory C 
WHERE C.EmployeeID = A.EmployeeID 
ORDER BY c.CertificationID 
FOR XML PATH('')),1,1,'') AS CSV 
FROM tbl_PM_EmployeeCertificationMatrixHistory A 
GO 

如果你想在该CSV列表仅返回DISTINCT值，添加GROUP BY c.CertificationID上述ORDER BY

Answer 2

您需要关联的子查询和员工列表。以下列出了同一个表中的员工列表，但您可能有另一个表中包含此信息：

SELECT e.EmployeeID, 
     STUFF((SELECT ',' + CAST(C.CertificationID AS VARCHAR(100)) 
       FROM tbl_PM_EmployeeCertificationMatrixHistory C 
       where c.EmployeeID = e.EmployeeID 
       ORDER BY c.CertificationID 
       FOR XML PATH('') 
      ),1, 1,'') AS CSV 
from (select distinct EmployeeID 
     from tbl_PM_EmployeeCertificationMatrixHistory 
    ) e;