Запрос ниже возвращает информацию, которую вы ищете, насколько я понимаю.Ключевое предложение использует инструкцию EXCEPT в T-SQL.EXCEPT вернет все строки в первом запросе, которые не содержатся во втором.Мы можем использовать это здесь, чтобы определить сотрудников, которые не прошли все обязательные курсы или все дополнительные курсы.Для ясности я использовал общие табличные выражения, но вы также можете использовать CTE в качестве подзапросов.
;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
Однако, основываясь на ваших комментариях ниже, я написал новый запрос, в котором перечислены все отделы иИмя курсора, количество сотрудников, прошедших этот курс, общее количество сотрудников в отделе и процент сотрудников в отделе, прошедших курс.Как и раньше, я использую обычные табличные выражения, но вы можете легко преобразовать это для использования подзапросов.
;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
Я также включаю SQL, который использовал для настройки некоторых тестовых данных, чтобы вы моглисм. мои предположения, которые я, возможно, сделал, которые не соответствуют вашей собственной базе данных.
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)