Question

带有SQL Server 2005数据库的SQL Server 2008 R2 SMS

搜索，但无济于事。我想在每一行的末尾寻找所有员工的总数。我可以得到每个经理的计数，这很好。但是，我需要员工总数中的另一列进行进一步计算。

 Manager       IndID         HireDate           TermDate
=========      ======        ==========         ==========  
boss           EMP1          2013-01-02         
man            EMP2          2013-10-02         2014-03-06
man            EMP2          2013-04-02         2014-01-01
vp             EMP3          2012-05-02         2013-06-15

我期待或试图达到这样的目标

Manager      EmployeeCount     Terminations    TotalEmployees
=============================================================='
boss          1                0               4
man           2                2               4
vp            1                1               4

到目前为止，这是我的代码。我想我需要在那里包装一个select语句来获得行尾的员工总数，但我无法弄清楚语法或者是否在where语句之后。另外，如果下面的代码有点失误，我很抱歉，我试图从我拥有的其他行（连接等）中解析它。

SELECT  
   Manager
   , COUNT (DISTINCT IndID) EmployeeCount
   , SUM(CASE WHEN TermDate BETWEEN @StartDate AND @EndDate THEN 1 ELSE 0 END) Terminations
FROM 
   myTable 
WHERE 
   HireDate <= @EndDate 
   AND TermDate BETWEEN @StartDate AND @EndDate
    OR StartDate <= @EndDate AND TermDate IS NULL
GROUP BY 
   Manager

感谢您的帮助。

Answer 1

您可以使用窗口功能执行此操作。窗口函数可以嵌套在聚合中，因此：

SELECT  Manager,
        COUNT(IndID) as EmployeeCount,
        SUM(CASE WHEN TermDate BETWEEN @StartDate AND @EndDate THEN 1 ELSE 0 END) as Terminations,
        SUM(COUNT(*)) OVER () as TotalEmployees
FROM myTable 
WHERE HireDate <= @EndDate AND TermDate BETWEEN @StartDate AND @EndDate OR
      StartDate <= @EndDate AND TermDate IS NULL
GROUP BY Manager;

我认为您COUNT(DISTINCT)不需要EmployeeCount，所以我删除了DISTINCT。

Answer 2

WITH ROLLUP修改器也会为您提供所需的内容。

http://technet.microsoft.com/en-us/library/ms189305(v=sql.90).aspx

SELECT Manager
, COUNT (DISTINCT IndID) EmployeeCount
, SUM(CASE WHEN TermDate BETWEEN @StartDate AND @EndDate THEN 1 ELSE 0 END) Terminations
FROM myTable 
WHERE HireDate <= @EndDate AND TermDate BETWEEN @StartDate AND @EndDate
               OR StartDate <= @EndDate AND TermDate IS NULL
GROUP BY Manager WITH ROLLUP

每行末尾的总列数

2 个答案: