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USE UniversityDB;
GO
SELECT
I.FirstName + ' ' + I.LastName AS [نام مدرس],
COUNT(DISTINCT C.CourseID) AS [تعداد دورهها],
COUNT(DISTINCT E.StudentID) AS [تعداد کل دانشجویان],
AVG(ISNULL(C.Price, 0)) AS [میانگین قیمت دورهها],
CASE
WHEN COUNT(DISTINCT C.CourseID) > 2 THEN N'Senior'
ELSE N'Junior'
END AS [سطح مدرس]
FROM
Instructors I
JOIN Courses C ON I.InstructorID = C.InstructorID
LEFT JOIN Enrollments E ON C.CourseID = E.CourseID
GROUP BY
I.InstructorID,
I.FirstName,
I.LastName
HAVING
COUNT(DISTINCT E.StudentID) >= 3;
سوال 12:
USE UniversityDB;
GO
SELECT
S.FirstName + ' ' + S.LastName AS [نام دانشجو],
COUNT(LV.ViewID) AS [تعداد کل ویدیوهای دیده],
COUNT(DISTINCT E.CourseID) AS [تعداد دورههای ثبت نام شده],
CASE
WHEN COUNT(LV.ViewID) > 3 THEN 'Active'
ELSE 'Inactive'
END AS [وضعیت فعالیت]
FROM
Students S
INNER JOIN Enrollments E ON S.StudentID = E.StudentID
LEFT JOIN LessonViews LV ON S.StudentID = LV.StudentID
GROUP BY
S.StudentID,
S.FirstName,
S.LastName;
سوال 13:
نسخه صحیح کوئری:
SELECT
c.CourseTitle,
COUNT(e.StudentID) AS StudentCount
FROM Courses c
LEFT JOIN Enrollments e
ON c.CourseID = e.CourseID
AND e.EnrollDate >= '2024-01-01' -- شرط تاریخ به اینجا منتقل شد
GROUP BY c.CourseTitle;
سوال 14:
کد Stored Procdure:
CREATE PROCEDURE sp_StudentsAboveAveragePayment
AS
BEGIN
SET NOCOUNT ON;
SELECT
S.StudentID,
S.FirstName + ' ' + S.LastName AS FullName,
SUM(P.Amount) AS TotalPayment
FROM
Students S
INNER JOIN Payments P ON S.StudentID = P.StudentID
GROUP BY
S.StudentID, S.FirstName, S.LastName
HAVING
SUM(P.Amount) > (
-- محاسبه میانگین مجموع پرداختهای تمام دانشجویان
SELECT AVG(SumPerStudent)
FROM (
SELECT SUM(Amount) AS SumPerStudent
FROM Payments
GROUP BY StudentID
) AS StudentTotals
);
END;
GO
سوال 15:
Stored Procedure:
CREATE PROCEDURE sp_ReportCourseRevenue
@StartDate DATE,
@EndDate DATE
AS
BEGIN
SET NOCOUNT ON;
SELECT
c.CourseTitle AS [عنوان دوره],
COUNT(e.EnrollmentID) AS [تعداد ثبت نامها],
SUM(ISNULL(p.Amount, 0)) AS [مجموع پرداخت],
CASE
WHEN SUM(ISNULL(p.Amount, 0)) >= 5000000 THEN 'High Revenue'
ELSE 'Low Revenue'
END AS [وضعیت دوره]
FROM
Courses c
INNER JOIN Enrollments e ON c.CourseID = e.CourseID
LEFT JOIN Payments p ON e.StudentID = p.StudentID
WHERE
e.EnrollDate BETWEEN @StartDate AND @EndDate
GROUP BY
c.CourseID, c.CourseTitle;
END;
GO
سوال 16:
CREATE TRIGGER trg_HighValueStudent
ON Payments
AFTER INSERT, UPDATE
AS
BEGIN
SET NOCOUNT ON;
DECLARE @StudentID INT;
DECLARE @TotalAmount INT;
-- تعریف یک کرسر (Cursor) برای بررسی دانشجو هایی که در این عملیات تغییر کردهاند
DECLARE cur CURSOR FOR
SELECT DISTINCT StudentID FROM inserted;
OPEN cur;
FETCH NEXT FROM cur INTO @StudentID;
WHILE @@FETCH_STATUS = 0
BEGIN
-- محاسبه مجموع کل پرداختهای این دانشجو در جدول اصلی
SELECT @TotalAmount = SUM(ISNULL(Amount, 0))
FROM Payments
WHERE StudentID = @StudentID;
-- بررسی شرط و نمایش پیام
IF @TotalAmount > 10000000
BEGIN
PRINT 'High Value Student';
-- اگه میخوای بدونی کدوم دانشجو، خط زیر فعال شود
-- PRINT 'High Value Student (Student ID: ' + CAST(@StudentID AS VARCHAR(10)) + ')';
END
FETCH NEXT FROM cur INTO @StudentID;
END
CLOSE cur;
DEALLOCATE cur;
END;
GO |