Question

我有以下数据库设计：

Employees Table: EmployeeID, Name, OrgCode
Departments Table: OrgCode, DepatName
CompleteSurvey Table: ID, ParticipantID

我需要开发一个表格，显示每个部门的员工总数，以及每个部门完成调查的参与者总数。然后，我想显示每个部门的参与百分比，主要等于参与者总数/员工总数。

我想出了以下两个查询，但我必须提出一个显示上述要求的查询，那么该怎么做？

每个部门的员工总数：

SELECT COUNT(DISTINCT dbo.Employees.EmployeeID) AS [Total Number of Employees], 
       dbo.Departments.DepartmentName
FROM dbo.Departments 
INNER JOIN dbo.Employees ON dbo.Departments.OrgCode = dbo.Employees.OrgCode
GROUP BY dbo.Departments.DepartmentName

每个部门的参与者总数：

 SELECT COUNT(DISTINCT dbo.Employees.EmployeeID) AS [Total Number of Employees], 
 dbo.Departments.DepartmentName
 FROM dbo.Departments 
 INNER JOIN dbo.Employees ON dbo.Departments.OrgCode = dbo.Employees.OrgCode 
 INNER JOIN dbo.CompleteSurvey ON dbo.Employees.EmployeeID = dbo.CompleteSurvey.RespondantID
 GROUP BY dbo.Departments.DepartmentName

显示参与者的第二个查询的问题，即使他们没有参与者也没有显示所有部门，它应该显示零。

更新

基本上，我想要的是有一个查询，显示每个部门的员工总数以及每个部门完成调查的参与者总数，并显示参与的百分比。

Answer 1

你看起来像这样（使用表变量）

DECLARE @Employees Table(EmployeeID INT, Name VARCHAR(50), OrgCode VARCHAR(50) )  
DECLARE @Departments Table( OrgCode INT, DepartmentName  VARCHAR(50)     )
DECLARE @CompleteSurvey Table( ID INT, RespondantID INT) 

INSERT INTO  @Employees VALUES(12,'Emp 12', 1000),(13,'Emp 13', 1000),(112,'Emp 112', 2000),    (113,'Emp 114', 2000)
INSERT INTO @Departments VALUES(1000, 'dept 1000'),(2000, 'dept 2000')
,(3000, 'no employee dept 3000')
INSERT INTO @CompleteSurvey VALUES (901,12), (901,112),(902,13), (902,112)

SELECT COUNT(DISTINCT  EmployeeID) AS [Total Number of Employees],  D.DepartmentName FROM     @Departments D 
LEFT OUTER JOIN @Employees E
ON  D.OrgCode =  E.OrgCode GROUP BY  D.DepartmentName

SELECT D.DepartmentName,COUNT(DISTINCT E.EmployeeID) AS [Total Number of Employees], 
COUNT(DISTINCT S.RespondantID )AS completed_survey ,
CASE WHEN COUNT(DISTINCT E.EmployeeID)>0 THEN COUNT(DISTINCT S.RespondantID )/
CAST(COUNT(DISTINCT E.EmployeeID)AS FLOAT)*100 ELSE 0 END AS particPerc
FROM @Departments D LEFT OUTER JOIN @Employees E ON D.OrgCode = E.OrgCode 
LEFT OUTER JOIN @CompleteSurvey S ON E.EmployeeID =S.RespondantID GROUP BY D.DepartmentName

输出：

 Total Number of Employees  DepartmentName
  2                       dept 1000
  2                       dept 2000
  0                       no employee dept 3000

最后我认为你要求的是

DepartmentName  Total Number of Employees   completed_survey   particPerc
dept 1000                  2                             2          100
dept 2000                  2                             1           50
no employee dept 3000        0                           0            0

Answer 2

如果我正确理解，当员工提交调查时，CompleteSurvey会填充EmployeeID，此查询将检索您需要的信息。您可以查看live test @ Sql Fiddle。

select Departments.DepatName, 
       count (Employees.EmployeeID) Employees, 
       count (CompleteSurvey.ID) Finished,
       cast (count (CompleteSurvey.ID) as float) / count (Employees.EmployeeID)
            PercentageFinished
  from Departments
 inner join Employees 
    on Departments.OrgCode = Employees.OrgCode
  left join CompleteSurvey 
    on Employees.EmployeeID = CompleteSurvey.ParticipantID
 group by Departments.DepatName

如果您需要所有部门，请使用此查询：

select Departments.DepatName, 
       count (Employees.EmployeeID) Employees, 
       count (CompleteSurvey.ID) Finished,
       case when count (Employees.EmployeeID) <> 0
            then cast (count (CompleteSurvey.ID) as float) 
                     / count (Employees.EmployeeID)
            else 0
        end PercentageFinished
  from Departments
  left join Employees 
    on Departments.OrgCode = Employees.OrgCode
  left join CompleteSurvey 
    on Employees.EmployeeID = CompleteSurvey.ParticipantID
 group by Departments.DepatName

新test @ Sql Fiddle。

如何显示每个部门的参与百分比？

2 个答案: