Mega Code Archive

Cascade inserts into myStudent into session and lecturer

SQL> SQL> CREATE TABLE lecturer ( 2 id NUMBER(5) PRIMARY KEY, 3 first_name VARCHAR2(20), 4 last_name VARCHAR2(20), 5 major VARCHAR2(30), 6 current_credits NUMBER(3) 7 ); Table created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10001, 'Scott', 'Lawson','Computer Science', 11); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major, current_credits) 2 VALUES (10002, 'Mar', 'Wells','History', 4); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10003, 'Jone', 'Bliss','Computer Science', 8); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10004, 'Man', 'Kyte','Economics', 8); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10005, 'Pat', 'Poll','History', 4); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10006, 'Tim', 'Viper','History', 4); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10007, 'Barbara', 'Blues','Economics', 7); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10008, 'David', 'Large','Music', 4); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10009, 'Chris', 'Elegant','Nutrition', 8); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10010, 'Rose', 'Bond','Music', 7); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10011, 'Rita', 'Johnson','Nutrition', 8); 1 row created. SQL> SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits) 2 VALUES (10012, 'Sharon', 'Clear','Computer Science', 3); 1 row created. SQL> SQL> CREATE TABLE session ( 2 department CHAR(3), 3 course NUMBER(3), 4 description VARCHAR2(2000), 5 max_lecturer NUMBER(3), 6 current_lecturer NUMBER(3), 7 num_credits NUMBER(1), 8 room_id NUMBER(5) 9 ); Table created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('HIS', 101, 'History 101', 30, 11, 4, 20000); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('HIS', 301, 'History 301', 30, 0, 4, 20004); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('CS', 101, 'Computer Science 101', 50, 0, 4, 20001); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('ECN', 203, 'Economics 203', 15, 0, 3, 20002); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('CS', 102, 'Computer Science 102', 35, 3, 4, 20003); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('MUS', 410, 'Music 410', 5, 4, 3, 20005); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('ECN', 101, 'Economics 101', 50, 0, 4, 20007); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('NUT', 307, 'Nutrition 307', 20, 2, 4, 20008); 1 row created. SQL> SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id) 2 VALUES ('MUS', 100, 'Music 100', 100, 0, 3, NULL); 1 row created. SQL> SQL> SQL> CREATE TABLE myStudent ( 2 student_id NUMBER(5) NOT NULL, 3 department CHAR(3) NOT NULL, 4 course NUMBER(3) NOT NULL, 5 grade CHAR(1) 6 ); Table created. SQL> SQL> CREATE OR REPLACE TRIGGER myTrigger 2 BEFORE INSERT ON myStudent 3 FOR EACH ROW 4 DECLARE 5 v_Credits session.num_credits%TYPE; 6 BEGIN 7 SELECT num_credits 8 INTO v_Credits 9 FROM session 10 WHERE department = :new.department 11 AND course = :new.course; 12 13 UPDATE lecturer 14 SET current_credits = current_credits + v_Credits 15 WHERE ID = :new.student_id; 16 17 UPDATE session 18 SET current_lecturer = current_lecturer + 1 19 WHERE department = :new.department 20 AND course = :new.course; 21 END myTrigger; 22 / Trigger created. SQL> SQL> SQL> SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10000, 'CS', 102, 'A'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10002, 'CS', 102, 'B'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10003, 'CS', 102, 'C'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10000, 'HIS', 101, 'A'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10001, 'HIS', 101, 'B'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10002, 'HIS', 101, 'B'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10003, 'HIS', 101, 'A'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10004, 'HIS', 101, 'C'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10005, 'HIS', 101, 'C'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10006, 'HIS', 101, 'E'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10007, 'HIS', 101, 'B'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10008, 'HIS', 101, 'A'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10009, 'HIS', 101, 'D'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10010, 'HIS', 101, 'A'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10008, 'NUT', 307, 'A'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10010, 'NUT', 307, 'A'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10009, 'MUS', 410, 'B'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10006, 'MUS', 410, 'E'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10011, 'MUS', 410, 'B'); 1 row created. SQL> SQL> INSERT INTO myStudent (student_id, department, course, grade) 2 VALUES (10000, 'MUS', 410, 'B'); 1 row created. SQL> drop table session; Table dropped. SQL> SQL> drop table lecturer; Table dropped. SQL> SQL> drop table myStudent; Table dropped.