Upload New Text Document.txt

Exam/New Text Document.txt

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+سوال 11:
+
+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