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我是一名新的 ASP.NET 开发人员，现在我正在开发一个 Web 应用程序，作为公司的培训管理系统。我现在正在完成最后一项任务，该任务正在开发一个仪表板，该仪表板显示两个图表，这些图表显示以下内容：

  1. 图表显示了每个部门有多少员工参加了三种必修课程的统计数据。

  2. 另一个图表显示了公司每月每周培训的整体百分比

我知道如何使用 ASP.NET 图表控件，并且我已经开发了两个图表，这两个图表不同。

我现在的问题是我需要获取这两个图表的结果的 SQLServer 查询。

我的数据库设计如下：

Courses Table consists of: CourseName, CourseID, GroupID
Groups Table consists of: ID, GroupName
Employee Table consists of: Name, SSN, Department
Employee_Course Table consists of: employeeId, courseId

我想出了以下复杂的查询，但它需要更多的补充。

SELECT TOP (100) PERCENT dbo.employee.Department, dbo.employee.Name, T1.SSN
   , courses_2.CourseName
   , CASE
        WHEN dbo.employee_courses.courseId IS NULL THEN ' '
        ELSE 'Yes'
     END AS CourseId
FROM dbo.employee_courses
RIGHT OUTER JOIN dbo.courses AS courses_2
INNER JOIN
(
   SELECT employee_1.SSN, courses_1.CourseID
   FROM dbo.employee AS employee_1
   CROSS JOIN dbo.courses AS courses_1
) AS T1 ON courses_2.CourseID = T1.CourseID
INNER JOIN dbo.employee ON T1.SSN = dbo.employee.SSN
   ON dbo.employee_courses.employeeId = T1.SSN
   AND dbo.employee_courses.courseId = T1.CourseID
ORDER BY T1.SSN

我不知道如何使它适用于显示上述要求。

为了澄清这个问题，让我们假设我们有两种类型/组的课程；强制性和可选的。另外，我们有部门；A、B、C。假设每个部门完成必修课程的员工人数如下： A 部门：105 名员工中的 55 名，B 部门：114 名员工中的 78 名，C 部门：147 名员工中的 98 名

我想要这样一个查询，它可以为我提供完成必修课程以及每个部门的选修课程的员工百分比。因此，我可以开发一个图表，显示每个部门的两列（或两个系列），并显示每个部门的培训百分比

4

2 回答 2

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据我了解，下面的查询返回您正在寻找的信息。关键子句是使用 T-SQL 中的 EXCEPT 语句。EXCEPT 将返回第一个查询中不包含在第二个查询中的所有行。我们可以在这里使用它来确定尚未完成所有必修课程或所有可选课程的员工。为了清楚起见，我使用了公用表表达式，但您也可以将 CTE 用作子查询。

;with EmployeesWithRequiredCourses as
(
    select *
    from Employee
    where not exists
    (
        select CourseID
        from Courses
        inner join GroupTable on GroupTable.GroupID = Courses.GroupID
        where GroupTable.GroupName = 'Required'

        except

        select Employee_Course.CourseID
        from Employee_Course
        inner join Courses on Courses.CourseID = Employee_Course.CourseID
        inner join GroupTable on GroupTable.GroupID = Courses.GroupID
        where Employee_Course.EmployeeID = Employee.EmployeeID
        and GroupTable.GroupName = 'Required'
    )
),
EmployeesWithOptionalCourses as
(
    select *
    from Employee
    where not exists
    (
        select CourseID
        from Courses
        inner join GroupTable on GroupTable.GroupID = Courses.GroupID
        where GroupTable.GroupName = 'Optional'

        except

        select Employee_Course.CourseID
        from Employee_Course
        inner join Courses on Courses.CourseID = Employee_Course.CourseID
        inner join GroupTable on GroupTable.GroupID = Courses.GroupID
        where Employee_Course.EmployeeID = Employee.EmployeeID
        and GroupTable.GroupName = 'Optional'
    )
)
select  Employee.Department, 
        COUNT(EmployeesWithRequiredCourses.EmployeeID) as RequiredCourseCount,
        COUNT(EmployeesWithOptionalCourses.EmployeeID) as OptionalCourseCount,
        COUNT(Employee.EmployeeID) as EmployeeCount,
        CAST(COUNT(EmployeesWithRequiredCourses.EmployeeID) as real)/CAST(COUNT(Employee.EmployeeID) as real) as RequiredCoursePercentage,
        CAST(COUNT(EmployeesWithOptionalCourses.EmployeeID) as real)/CAST(COUNT(Employee.EmployeeID) as real) as OptionalCoursePercentage
from Employee
left outer join EmployeesWithRequiredCourses on EmployeesWithRequiredCourses.EmployeeID = Employee.EmployeeID
left outer join EmployeesWithOptionalCourses on EmployeesWithOptionalCourses.EmployeeID = Employee.EmployeeID
group by Employee.Department

但是，根据您在下面的评论，我编写了一个新查询，其中列出了每个部门和课程名称、已完成该课程的员工人数、部门中的员工总数以及部门中已完成的员工百分比课程。和以前一样，我使用的是公用表表达式，但您可以轻松地将其转换为使用子查询。

;with Departments as
(
    select Department, COUNT(*) as DepartmentEmployeeCount
    from Employee
    group by Department
),
DepartmentCourse as
(
    select Department, CourseName, DepartmentEmployeeCount
    from Departments
    cross join Courses
),
CompletedCourses as
(
    select Department, CourseName, COUNT(*) as CourseCompletedCount
    from Employee
    inner join Employee_Course on Employee_Course.EmployeeID = Employee.EmployeeID
    inner join Courses on Courses.CourseID = Employee_Course.CourseID
    group by Department, CourseName
)
select  DepartmentCourse.Department, 
        DepartmentCourse.CourseName, 
        CourseCompletedCount, 
        DepartmentEmployeeCount,
        CAST(ISNULL(CourseCompletedCount,0) as real)/CAST(DepartmentEmployeeCount as real) as CourseCompletionPercentage
from DepartmentCourse
left outer join CompletedCourses on CompletedCourses.Department = DepartmentCourse.Department and CompletedCourses.CourseName = DepartmentCourse.CourseName

我还包括了我用来设置一些测试数据的 SQL，这样你就可以看到我做出的与你自己的数据库不匹配的假设。

create table GroupTable
(
    GroupID int not null,
    GroupName varchar(50)
)


create table Courses
(
    CourseID int not null,
    GroupID int,
    CourseName varchar(50)
)

create table Employee
(
    EmployeeID int not null,
    Name varchar(50),
    SSN varchar(11),
    Department varchar(50)
)

create table Employee_Course
(
    EmployeeID int not null,
    CourseID int not null
)

insert into GroupTable values (1, 'Required')
insert into GroupTable values (2, 'Optional')

insert into Courses values (1, 1, 'Course1')
insert into Courses values (2, 1, 'Course2')
insert into Courses values (3, 1, 'Course3')
insert into Courses values (4, 2, 'Course4')
insert into Courses values (5, 2, 'Course5')
insert into Courses values (6, 2, 'Course6')

insert into Employee values (1, 'Bob','122-45-1111', 'A')
insert into Employee values (2, 'Peter','124-45-2222', 'A')
insert into Employee values (3, 'Joe','125-45-3333', 'A')
insert into Employee values (4, 'Jimmy','126-45-4444', 'A')
insert into Employee values (5, 'Mary','127-45-5555', 'A')
insert into Employee values (6, 'Alice','122-45-6666', 'B')
insert into Employee values (7, 'Jennifer','124-45-7777', 'B')
insert into Employee values (8, 'Carter','125-45-8888', 'B')
insert into Employee values (9, 'Mason','126-45-9999', 'C')
insert into Employee values (10, 'Irina','127-45-0000', 'C')

insert into Employee_Course values (1,1)
insert into Employee_Course values (1,2)
insert into Employee_Course values (1,3)
insert into Employee_Course values (1,4)
insert into Employee_Course values (1,5)
insert into Employee_Course values (1,6)
insert into Employee_Course values (2,1)
insert into Employee_Course values (2,2)
insert into Employee_Course values (2,4)
insert into Employee_Course values (2,5)
insert into Employee_Course values (3,1)
insert into Employee_Course values (3,4)
insert into Employee_Course values (4,1)
insert into Employee_Course values (4,2)
insert into Employee_Course values (4,3)
insert into Employee_Course values (5,4)
insert into Employee_Course values (5,5)
insert into Employee_Course values (5,6)
insert into Employee_Course values (6,1)
insert into Employee_Course values (6,2)
insert into Employee_Course values (6,3)
insert into Employee_Course values (6,4)
insert into Employee_Course values (6,5)
insert into Employee_Course values (7,4)
insert into Employee_Course values (8,1)
insert into Employee_Course values (9,2)
insert into Employee_Course values (9,3)
insert into Employee_Course values (9,4)
insert into Employee_Course values (9,5)
insert into Employee_Course values (9,6)
insert into Employee_Course values (10,1)
insert into Employee_Course values (10,2)
insert into Employee_Course values (10,3)
insert into Employee_Course values (10,4)
insert into Employee_Course values (10,5)
insert into Employee_Course values (10,6)
于 2011-11-14T19:55:15.883 回答
0

听起来你需要做一些聚合。

像这样的东西应该可以让您按部门计算参加特定课程的员工人数

SELECT COUNT(*), CourseID, Department
FROM Courses c
INNER JOIN Employee_Course ec ON c.CourseID = ec.CourseID
INNER JOIN Employee e ON ec.EmployeeID = e.EmployeeID
HAVING CourseID IN (requiredCourseIDs)
GROUP BY CourseID, GroupID

这是在正确的轨道上吗？

于 2011-11-14T05:19:32.793 回答