added Übungszettel 11

2025-02-13 14:58:45 +01:00
parent 25bf599c6c
commit 66c3899154
16 changed files with 4976 additions and 2 deletions
--- a/Uebungszettel_6.sql
+++ b/Uebungszettel_6.sql
@@ -0,0 +1,128 @@
+-- Aufgabe 6.1
+DECLARE
+  vr_zip ZIPCODE%ROWTYPE;
+
+BEGIN
+  SELECT *
+  INTO vr_zip
+  FROM zipcode
+  WHERE rownum < 2;
+
+  DBMS_OUTPUT.PUT_LINE('City: '||vr_zip.city);
+  DBMS_OUTPUT.PUT_LINE('State: '||vr_zip.state);
+  DBMS_OUTPUT.PUT_LINE('Zip: '||vr_zip.zip);
+END;
+/
+
+-- Es wird die Stadt, der State und die Postleitzahl vom ersten Datensatz in der zipcode Tabelle angezeigt.
+
+-- Aufgabe 6.2
+DECLARE
+    CURSOR c_zip IS
+    SELECT *
+    FROM zipcode;
+    vr_zip ZIPCODE%ROWTYPE;
+BEGIN
+    OPEN c_zip;
+    LOOP
+        FETCH c_zip INTO vr_zip;
+        EXIT WHEN c_zip%NOTFOUND;
+        DBMS_OUTPUT.PUT_LINE(vr_zip.zip || vr_zip.city || vr_zip.state);
+    END LOOP;
+    CLOSE c_zip;
+END;
+/
+
+-- Aufgabe 6.3
+DECLARE
+    CURSOR c_student_name IS
+    SELECT *
+    FROM STUDENT
+    WHERE rownum <= 5;
+    vr_student STUDENT%ROWTYPE;
+BEGIN
+    OPEN c_student_name;
+    LOOP
+        FETCH c_student_name INTO vr_student;
+        EXIT WHEN c_student_name%NOTFOUND;
+        DBMS_OUTPUT.PUT_LINE('Student name: ' || vr_student.FIRST_NAME || ' ' || vr_student.LAST_NAME);
+    END LOOP;
+    CLOSE c_student_name;
+END;
+/
+
+
+-- Aufgabe 6.4
+--     EXIT WHEN c_student%NOTFOUND;
+	
+-- 	DBMS_OUTPUT.PUT_LINE('STUDENT ID : '||v_sid);
+--   END LOOP;
+
+--   CLOSE c_student;
+  
+-- EXCEPTION
+--   WHEN OTHERS THEN
+--     IF c_student%ISOPEN THEN
+--       CLOSE c_student;
+--     END IF;
+-- END;
+--/
+-- a): %NOTFOUND -> Prüft ob keine weiteren Einträge gefunden werden. %ISOPEN -> Prüft ob akutell noch der Cursor offen ist. 
+-- b):
+DECLARE
+    CURSOR c_student IS
+        SELECT student_id
+        FROM student;
+    v_sid student.student_id%TYPE;
+BEGIN
+    OPEN c_student;
+    LOOP
+        FETCH c_student INTO v_sid;
+        EXIT WHEN c_student%NOTFOUND;
+        DBMS_OUTPUT.PUT_LINE('Student Id: '||v_sid);
+    END LOOP;
+    CLOSE c_student;
+EXCEPTION
+    WHEN OTHERS THEN
+        IF c_student%ISOPEN THEN
+            CLOSE c_student;
+        END IF;
+        RAISE;
+END;
+/
+
+-- Aufgabe 6.5
+DECLARE
+    CURSOR c_student IS
+    SELECT student_id, first_name, last_name, (SELECT COUNT(*) FROM enrollment e WHERE e.student_id = s.student_id) AS class_count
+    FROM student s
+    WHERE student_id < 110;
+    vr_student c_student%ROWTYPE;
+BEGIN
+    OPEN c_student;
+    LOOP
+        FETCH c_student INTO vr_student;
+        EXIT WHEN c_student%NOTFOUND;
+        DBMS_OUTPUT.PUT_LINE('Student INFO: ID ' || vr_student.student_id || ' is ' || vr_student.first_name || ' ' || vr_student.last_name || ' is enrolled in ' || vr_student.class_count || ' classes.');
+        END LOOP;
+    CLOSE c_student;
+END;
+/
+
+-- Aufgabe 6.6
+DECLARE
+    CURSOR c_group_discount IS
+        SELECT co.course_no, co.cost
+        FROM course co
+        WHERE (SELECT COUNT(*) FROM enrollment e 
+            JOIN section s ON e.section_id = s.section_id 
+            WHERE s.course_no = co.course_no) >= 8;
+BEGIN
+    FOR r_group_discount IN c_group_discount LOOP
+        UPDATE course
+        SET cost = cost * 0.95
+        WHERE course_no = r_group_discount.course_no;
+    END LOOP;
+END;
+/
+SELECT 'Course No: ' ||  course_no || ', Cost: ' || cost FROM Course;