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PL-SQL.sql

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+SET SERVEROUTPUT ON
+
+DECLARE
+max_number results.MARK%type;
+max_student_id results.STUDENT_ID%type;
+
+BEGIN
+SELECT MAX(mark) into max_number
+from results;
+SELECT STUDENT_ID into max_student_id
+From results
+where MARK=max_number;
+DBMS_OUTPUT.PUT_LINE('Student ID '|| max_student_id || ' have max number which is ' || max_number);
+END;
+/
+
+
+DECLARE
+student_mark results.MARK%type;
+name student.FNAME%type :='alif';
+
+BEGIN
+SELECT MARK into student_mark
+FROM student ,results
+WHERE student.STUDENT_ID=results.STUDENT_ID AND
+FNAME=name;
+DBMS_OUTPUT.PUT_LINE('STUDENT NAME: '|| name || ' MARK: ' || student_mark);
+END;
+/
+
+
+DECLARE
+teacher_name  teacher.FNAME%type := 'masum';
+coursename course.COURSE_NAME%type;
+
+BEGIN
+SELECT COURSE_NAME into coursename
+FROM teacher,course
+WHERE teacher.COURSE_ID=course.COURSE_ID AND
+FNAME=teacher_name;
+DBMS_OUTPUT.PUT_LINE('Teacher name:' || teacher_name || ' Course Name: ' || coursename);
+END;
+/
+
+
+DECLARE
+name student.FNAME%type :='jeba';
+student_mark results.MARK%type;
+grade VARCHAR(5);
+BEGIN
+SELECT MARK into student_mark
+FROM student ,results
+WHERE student.STUDENT_ID=results.STUDENT_ID AND
+FNAME=name;
+
+IF student_mark >=80 THEN
+   grade :='A+';
+ELSIF student_mark>=70 THEN
+   grade :='A';
+ELSIF student_mark>=60 THEN
+   grade :='A-';
+ELSIF student_mark>=50 THEN
+   grade :='B';
+ELSIF student_mark>=40 THEN
+   grade :='C';
+ELSE
+   grade :='F';
+END IF;
+DBMS_OUTPUT.PUT_LINE('STUDENT NAME: '|| name || ' GRADE: ' || grade);
+END;
+/
+
+
+DECLARE
+CURSOR lec_cur IS SELECT TIME , DURATION FROM lecture;
+lec_record lec_cur%ROWTYPE;
+
+BEGIN
+OPEN lec_cur ;
+  FOR i in 1..6
+  LOOP
+  FETCH lec_cur INTO lec_record;
+  DBMS_OUTPUT.PUT_LINE('DATE : ' || lec_record.TIME || ' DURATION : ' || lec_record.DURATION);
+  END LOOP;
+CLOSE lec_cur;
+END;
+/
+
+DECLARE
+CURSOR lec_cur IS SELECT TIME , DURATION FROM lecture;
+lec_record lec_cur%ROWTYPE;
+
+BEGIN
+OPEN lec_cur ;
+  WHILE lec_cur%ROWCOUNT <6
+  LOOP
+  FETCH lec_cur INTO lec_record;
+  --EXIT WHEN lec_cur%ROWCOUNT >6;
+  DBMS_OUTPUT.PUT_LINE('DATE : ' || lec_record.TIME || ' DURATION : ' || lec_record.DURATION);
+  END LOOP;
+CLOSE lec_cur;
+END;
+/
+
+DECLARE
+CURSOR lec_cur IS SELECT TIME , DURATION FROM lecture;
+lec_record lec_cur%ROWTYPE;
+
+BEGIN
+OPEN lec_cur ;
+  LOOP
+  FETCH lec_cur INTO lec_record;
+  EXIT WHEN lec_cur%ROWCOUNT >6;
+  DBMS_OUTPUT.PUT_LINE('DATE : ' || lec_record.TIME || ' DURATION : ' || lec_record.DURATION);
+  END LOOP;
+CLOSE lec_cur;
+END;
+/
+
+CREATE OR REPLACE PROCEDURE getcoursename IS
+c_id course.COURSE_ID%type;
+c_name course.COURSE_NAME%type;
+
+BEGIN
+c_id :=100;
+SELECT COURSE_NAME into c_name
+from course 
+where COURSE_ID=c_id;
+DBMS_OUTPUT.PUT_LINE('Course ID : ' || c_id || ' Course name : ' || c_name);
+END;
+/
+SHOW ERROR;
+
+
+BEGIN
+getcoursename();
+END;
+/
+
+CREATE OR REPLACE PROCEDURE add_student (
+s_id student.STUDENT_ID%type,
+s_name student.FNAME%type,
+c_id student.COURSE_ID%type) IS
+BEGIN
+INSERT INTO student (STUDENT_ID,FNAME,COURSE_ID)
+VALUES (s_id,s_name,c_id);
+COMMIT;
+END add_student;
+/
+SHOW ERRORS;
+
+BEGIN
+add_student(23,'karib',106);
+END;
+/
+
+CREATE OR REPLACE FUNCTION avg_mark RETURN NUMBER IS
+avg_mark results.MARK%type;
+BEGIN
+SELECT AVG(MARK) INTO avg_mark
+FROM results;
+RETURN avg_mark;
+END;
+/
+SHOW ERRORS;
+
+BEGIN
+dbms_output.put_line('Average mark: ' || avg_mark);
+END;
+/
+
+
+CREATE OR REPLACE FUNCTION teacher_name(
+   t_id IN teacher.TEACHER_ID%type) RETURN VARCHAR IS
+t_name teacher.FNAME%type;
+BEGIN
+SELECT FNAME INTO t_name
+From teacher
+WHERE TEACHER_ID=t_id;
+RETURN t_name;
+END;
+/
+SHOW ERRORS;
+
+
+BEGIN
+dbms_output.put_line('Teacher name: ' || teacher_name(003));
+END;
+/
+
+
+
+CREATE OR REPLACE TRIGGER check_mark BEFORE INSERT OR UPDATE ON
+results
+FOR EACH ROW
+DECLARE
+c_min constant number(8) := 0;
+c_max constant number(8) := 100;
+BEGIN
+IF :new.mark > c_max OR :new.mark < c_min THEN
+RAISE_APPLICATION_ERROR(-20000,'New Mark is invalid');
+END IF;
+END;
+/
+SHOW ERRORS;
+INSERT INTO results VALUES 
+(025,100,'pass',105);
+
+
+SAVEPOINT c1;
+INSERT INTO results VALUES 
+(21,100,'pass',75);
+INSERT INTO results VALUES 
+(22,100,'pass',75);
+
+ROLLBACK to c1;
+
+SELECT * FROM results;
+
+
+SELECT SYSDATE FROM DUAL;
+SELECT CURRENT_DATE FROM DUAL;
+SELECT SYSTIMESTAMP FROM DUAL;

ddl.sql

@@ -0,0 +1,77 @@
+drop table results;
+drop table lecture;
+drop table teacher;
+drop table student;
+drop table course;
+
+CREATE TABLE course
+  (COURSE_NAME   VARCHAR2(20),
+   COURSE_ID    NUMBER(3) NOT NULL,
+   DURATION      NUMBER(3),
+   COURSE_START DATE,
+   COURSE_END   DATE,
+   PRIMARY KEY (COURSE_ID)
+);
+
+
+CREATE TABLE student
+  (STUDENT_ID      NUMBER(3) NOT NULL,
+   FNAME           VARCHAR2(15),
+   LNAME           VARCHAR2(15),
+   GENDER          VARCHAR2(10),
+   EMAIL           VARCHAR2(40) ,
+   CONTACT        NUMBER(12),
+   COURSE_ID       NUMBER(3) NOT NULL,
+   PRIMARY KEY (STUDENT_ID),
+   FOREIGN KEY (COURSE_ID) REFERENCES course ON DELETE CASCADE
+) ;
+
+
+
+CREATE TABLE teacher 
+(
+   TEACHER_ID      NUMBER(3) NOT NULL,
+   FNAME           VARCHAR2(15),
+   LNAME           VARCHAR2(15),
+   GENDER          VARCHAR2(10),
+   EMAIL           VARCHAR2(40) ,
+   CONTACT        NUMBER(12),
+   COURSE_ID       NUMBER(3) NOT NULL,
+   PRIMARY KEY (TEACHER_ID),
+   FOREIGN KEY (COURSE_ID) REFERENCES course ON DELETE CASCADE
+) ;
+
+
+CREATE TABLE lecture
+  (
+   LECTURE_ID      NUMBER(3) NOT NULL,
+   TIME            DATE,
+   DURATION        VARCHAR2(15),
+   LECTURE_START   VARCHAR2(20),
+   LECTURE_END     VARCHAR2(20) ,
+   STUDENT_ID      NUMBER(3) NOT NULL,
+   TEACHER_ID      NUMBER(3) NOT NULL,
+   COURSE_ID       NUMBER(3) NOT NULL,
+   PRIMARY KEY (LECTURE_ID,STUDENT_ID),
+   FOREIGN KEY (STUDENT_ID) REFERENCES student ON DELETE CASCADE,
+   FOREIGN KEY (TEACHER_ID) REFERENCES teacher ON DELETE CASCADE,
+   FOREIGN KEY (COURSE_ID) REFERENCES course ON DELETE CASCADE
+) ;
+
+CREATE TABLE results
+(
+    STUDENT_ID     NUMBER(3) NOT NULL,
+    COURSE_ID      NUMBER(3) NOT NULL,
+    RESULT         VARCHAR2(10),
+    MARK           NUMBER(3),
+    PRIMARY KEY(STUDENT_ID),
+    FOREIGN KEY (STUDENT_ID) REFERENCES student ON DELETE CASCADE,
+    FOREIGN KEY (COURSE_ID) REFERENCES course ON DELETE CASCADE
+);
+
+
+DESCRIBE course;
+DESCRIBE student;
+DESCRIBE teacher;
+DESCRIBE lecture;
+DESCRIBE results;