Question

我有以下员工详细信息表

EmployeeName   CompayId    CompanyLastActive
---------------------------------------------------------
robort          112        10 Jun 2015 09:30 
john            113        11 Jun 2015 11:10
sunny           114        14 Jun 2015 16:10
sumanth         114        15 Jun 2015 18:11
usha            115        07 Jun 2015 13:14
sudheer         115        14 Jun 2015 17:10
sweety          115        08 Jun 2015 16:34

我需要根据CompanyID获取最新的员工活动时间，并使用逗号分隔的EmployeeName，如下所示

EmployeeName           CompayId        CompanyLastActive
---------------------------------------------------------
robort                 112               10 Jun 2015 09:30 
john                   113               11 Jun 2015 11:10
sunny, sumanth         114               15 Jun 2015 18:11        
usha, sudheer, sweety   115               14 Jun 2015 17:10

请帮我解决。

Answer 1

SELECT EmployeeName = STUFF((
          SELECT ',' + e1.EmployeeName
          FROM dbo.Employee e1
          WHERE e.CompayId = e1.CompayId
          FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 1, ''),
        e.CompayId,
        MAX(CompanyLastActive) as CompanyLastActive
FROM dbo.Employee e
GROUP BY e.CompayID
ORDER BY e.CompayId

结果：

EmployeeName        CompayId    CompanyLastActive
-------------------------------------------------------
robort              112         June, 10 2015 09:30:00
john                113         June, 11 2015 11:10:00
sunny,sumanth       114         June, 15 2015 18:11:00
usha,sudheer,sweety 115         June, 14 2015 17:10:00

SQL Fiddle中的示例结果。

Answer 2

检查一下，我没有检查过这个，因为我感觉懒得构建架构，它可能会错误地抛出，你可以处理它

SELECT 
  Results.CompayId,
  STUFF((
    SELECT ', ' + CAST(EmployeeName AS VARCHAR(MAX)) 
    FROM YourTable 
    WHERE (ID = Results.ID) 
    FOR XML PATH(''),TYPE).value('(./text())[1]','VARCHAR(MAX)')
  ,1,2,'') AS NameValues
  ,max(Results.CompanyLastActive) as CompanyLastActive
FROM YourTable Results
GROUP BY CompayId

Answer 3

您可以使用此查询：

SELECT EmployeeNames = dbo.EmployeeNamesPerCompany(CompanyID,', '), 
       CompanyID, 
       CompanyLastActive = MAX(CompanyLastActive)
FROM Employee e
GROUP BY CompanyID
ORDER BY MAX(CompanyLastActive)

如果你已经创建了这样的标量值函数：

CREATE FUNCTION [dbo].[EmployeeNamesPerCompany]
(
    @companyID Int,
    @delimiter varchar(5)
)
RETURNS VARCHAR(8000)
AS
BEGIN
    DECLARE @Names VARCHAR(8000) 
    SELECT   @Names = COALESCE(@Names + @delimiter, '') + e.EmployeeName
    FROM    Employee e
    WHERE e.CompanyId = @companyID
    ORDER BY e.EmployeeName
    return @Names
END

Sql-Fiddle Demo

逗号分隔的名称基于公司ID

3 个答案: