PL/SQL 程序块

DECLARE 
BARCODE VARCHAR(50);
BEGIN
  BARCODE := 'A';
  IF BARCODE<>'A' then
    SELECT 1 FROM sam_users;
  ELSE
    SELECT 2 FROM sam_users;
  END IF;
END;


DECLARE 
ENAME VARCHAR(50);
BEGIN
  ENAME := 'SMITH';
  IF ENAME<>'A' then
    SELECT 1 Into ENAME  FROM dual;
    DBMS_OUTPUT.PUT_LINE(ENAME);
  ELSE
    SELECT 2 Into ENAME FROM dual;
     DBMS_OUTPUT.PUT_LINE(ENAME);
  END IF;
END;


DECLARE 
ENAME VARCHAR(50);
BEGIN
  ENAME := 'SMITH';
  IF ENAME<>'A' then
    execute immediate 'SELECT 1   FROM dual';
  ELSE
      execute immediate 'SELECT 2  FROM dual';
  END IF;
END;