Declare variables which will be used in SQL statements : Variable Declare « PL SQL « Oracle PL / SQL

1. Oracle PL / SQL
2. PL SQL
3. Variable Declare

Declare variables which will be used in SQL statements

 
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>
SQL>
SQL> DECLARE
  2    v_NewMajor VARCHAR2(10) := 'History';
  3    myFirstName VARCHAR2(10) := 'Scott';
  4    v_LastName VARCHAR2(10) := 'Urman';
  5  BEGIN
  6    UPDATE lecturer
  7      SET major = v_NewMajor
  8      WHERE first_name = myFirstName
  9      AND last_name = v_LastName;
 10    IF SQL%NOTFOUND THEN
 11      INSERT INTO lecturer (ID, first_name, last_name, major)
 12        VALUES (10020, myFirstName, v_LastName, v_NewMajor);
 13    END IF;
 14  END;
 15  /

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL> drop table lecturer;

Table dropped.

SQL>

 

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