Declare variables to be used in the block : Variable init « PL SQL « Oracle PL / SQL

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Oracle PL / SQL » PL SQL » Variable init 
Declare variables to be used in the block
 
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', 3011420000);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('HIS', 301'History 301', 300420004);

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', 500420001);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('ECN', 203'Economics 203', 150320002);

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', 353420003);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('MUS', 410'Music 410', 54320005);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('ECN', 101'Economics 101', 500420007);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('NUT', 307'Nutrition 307', 202420008);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('MUS', 100'Music 100', 10003, NULL);

row created.

SQL>
SQL> DECLARE
  2    v_Department       CHAR(3)  := 'ECN';
  3    v_Course           NUMBER(3:= 203;
  4    v_Description      VARCHAR2(20:= 'Economics 203';
  5    studentMax      NUMBER := 15;
  6    studentCount       NUMBER := 0;
  7    v_NumCredits       NUMBER := 3;
  8    v_RoomID           NUMBER := 99997;
  9  BEGIN
 10    INSERT INTO session (department, course, description, max_lecturer,
 11                         current_lecturer, num_credits, room_id)
 12      VALUES (v_Department, v_Course, v_Description, studentMax,
 13              studentCount, v_NumCredits, v_RoomID);
 14  END;
 15  /

PL/SQL procedure successfully completed.

SQL>
SQL> select from session;

DEP     COURSE
--- ----------
DESCRIPTION
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS    ROOM_ID
------------ ---------------- ----------- ----------
HIS        101
History 101
          30               11           4      20000

HIS        301
History 301
          30                0           4      20004

DEP     COURSE
--- ----------
DESCRIPTION
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS    ROOM_ID
------------ ---------------- ----------- ----------

CS         101
Computer Science 101
          50                0           4      20001

ECN        203
Economics 203

DEP     COURSE
--- ----------
DESCRIPTION
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS    ROOM_ID
------------ ---------------- ----------- ----------
          15                0           3      20002

CS         102
Computer Science 102
          35                3           4      20003

MUS        410

DEP     COURSE
--- ----------
DESCRIPTION
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS    ROOM_ID
------------ ---------------- ----------- ----------
Music 410
           5                4           3      20005

ECN        101
Economics 101
          50                0           4      20007


DEP     COURSE
--- ----------
DESCRIPTION
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS    ROOM_ID
------------ ---------------- ----------- ----------
NUT        307
Nutrition 307
          20                2           4      20008

MUS        100
Music 100
         100                0           3

DEP     COURSE
--- ----------
DESCRIPTION
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
MAX_LECTURER CURRENT_LECTURER NUM_CREDITS    ROOM_ID
------------ ---------------- ----------- ----------

ECN        203
Economics 203
          15                0           3      99997


10 rows selected.

SQL>
SQL> drop table session;

Table dropped.

SQL>

 
Related examples in the same category
1. An initialization using the assignment operator (:=)
2. No initial value but Has a size
3. Assign init value to a number
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