Use of EXECUTE IMMEDIATE for single-row queries.

  
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> DECLARE
  2    v_SQLQuery VARCHAR2(200);
  3    v_Class session%ROWTYPE;
  4    v_Description session.description%TYPE;
  5  BEGIN
  6    v_SQLQuery :=
  7      'SELECT description ' ||
  8      '  FROM session ' ||
  9      '  WHERE department = ''ECN''' ||
 10      '  AND course = 203';
 11
 12    EXECUTE IMMEDIATE v_SQLQuery
 13      INTO v_Description;
 14
 15    DBMS_OUTPUT.PUT_LINE('Fetched ' || v_Description);
 16
 17    v_SQLQuery :=
 18      'SELECT * ' ||
 19      '  FROM session ' ||
 20      '  WHERE description = :description';
 21    EXECUTE IMMEDIATE v_SQLQuery
 22      INTO v_Class
 23      USING v_Description;
 24
 25    DBMS_OUTPUT.PUT_LINE(
 26      'Fetched ' || v_Class.department || ' ' || v_Class.course);
 27
 28    v_SQLQuery := 'SELECT * FROM session';
 29    EXECUTE IMMEDIATE v_SQLQuery
 30      INTO v_Class;
 31  END;
 32  /
Fetched Economics 203
Fetched ECN 203
DECLARE
*
ERROR at line 1:
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at line 29


SQL>
SQL> drop table session;

Table dropped.

SQL>

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Use of EXECUTE IMMEDIATE for single-row queries. : Execute Immediate « PL SQL « Oracle PL / SQL

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