PL SQL Oracle PLSQL

SQL>
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> select * from lecturer;
      ID FIRST_NAME           LAST_NAME            MAJOR                          CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Scott                Lawson               Computer Science                         11.00
######## Mar                  Wells                History                                   4.00
######## Jone                 Bliss                Computer Science                          8.00
######## Man                  Kyte                 Economics                                 8.00
######## Pat                  Poll                 History                                   4.00
######## Tim                  Viper                History                                   4.00
######## Barbara              Blues                Economics                                 7.00
######## David                Large                Music                                     4.00
######## Chris                Elegant              Nutrition                                 8.00
######## Rose                 Bond                 Music                                     7.00
######## Rita                 Johnson              Nutrition                                 8.00
      ID FIRST_NAME           LAST_NAME            MAJOR                          CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Sharon               Clear                Computer Science                          3.00
12 rows selected.
SQL>
SQL> CREATE TABLE myLogTable (
  2    code             NUMBER,
  3    message          VARCHAR2(200),
  4    info             VARCHAR2(100)
  5    );
Table created.
SQL>
SQL>
SQL>
SQL>
SQL> DECLARE
  2    myLecturerID NUMBER(5) := 10000;
  3    myFirstName VARCHAR2(20);
  4
  5  BEGIN
  6    SELECT first_name
  7      INTO myFirstName
  8      FROM lecturer
  9      WHERE id = myLecturerID;
 10    BEGIN
 11      INSERT INTO myLogTable (info)
 12        VALUES ('Hello from a nested block!');
 13    END;
 14  EXCEPTION
 15    WHEN NO_DATA_FOUND THEN
 16      BEGIN
 17        INSERT INTO myLogTable (info)
 18          VALUES ('Student 10,000 does not exist!');
 19      EXCEPTION
 20        WHEN OTHERS THEN
 21          DBMS_OUTPUT.PUT_LINE('Error inserting into myLogTable!');
 22      END;
 23  END;
 24  /
PL/SQL procedure successfully completed.
SQL>
SQL> select * from lecturer;
      ID FIRST_NAME           LAST_NAME            MAJOR                          CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Scott                Lawson               Computer Science                         11.00
######## Mar                  Wells                History                                   4.00
######## Jone                 Bliss                Computer Science                          8.00
######## Man                  Kyte                 Economics                                 8.00
######## Pat                  Poll                 History                                   4.00
######## Tim                  Viper                History                                   4.00
######## Barbara              Blues                Economics                                 7.00
######## David                Large                Music                                     4.00
######## Chris                Elegant              Nutrition                                 8.00
######## Rose                 Bond                 Music                                     7.00
######## Rita                 Johnson              Nutrition                                 8.00
      ID FIRST_NAME           LAST_NAME            MAJOR                          CURRENT_CREDITS
-------- -------------------- -------------------- ------------------------------ ---------------
######## Sharon               Clear                Computer Science                          3.00
12 rows selected.
SQL>
SQL> select * from myLogTable;
    CODE MESSAGE
-------- -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
---------
INFO
----------------------------------------------------------------------------------------------------
Student 10,000 does not exist!
SQL>
SQL> drop table lecturer;
Table dropped.
SQL>
SQL> drop table myLogTable;
Table dropped.
SQL>