Q.编写一个函数以显示该雇员在此组织中的工作天数。
A.
CREATE OR REPLACE FUNCTION Hire_Day(no emp.empno%TYPE) RETURN NUMBER AS
 vhiredate emp.hiredate%TYPE;
 vday NUMBER;

BEGIN
 SELECT hiredate INTO vhiredate FROM emp WHERE empno=no;
 vday:=CEIL(SYSDATE-vhiredate);
 RETURN vday;
END;
/
DECLARE
 vday NUMBER;
 vempno emp.empno%TYPE;
BEGIN
 vempno:=&empno;
 vday:=Hire_Day(vempno);
 DBMS_OUTPUT.PUT_LINE(vday);
END;
/

--SELECT empno,ename,sal,comm,hiredate FROM emp WHERE empno=:no;

第五阶段
Q.编写一个数据包，它有两个函数和两个过程以操作"emp"表。
  该数据包要执行的任务为：
   插入一个新雇员；删除一个现有雇员；显示指定雇员的整体薪水（薪水+佣金）；显示指定雇员所在部门名称。
A.
CREATE OR REPLACE PACKAGE emppack AS
 PROCEDURE insrec(pempno emp.empno%TYPE,pename emp.ename%TYPE,
      pjob emp.job%TYPE,pmgr emp.mgr%TYPE,
      phiredate emp.hiredate%TYPE,psal emp.sal%TYPE,
      pcomm emp.comm%TYPE,pdeptno emp.deptno%TYPE);
 PROCEDURE delrec(pempno IN NUMBER);
 FUNCTION selsal(pempno NUMBER) RETURN NUMBER;
 FUNCTION seldname(pempno NUMBER) RETURN VARCHAR2;
END;
/
CREATE OR REPLACE PACKAGE BODY emppack AS
 PROCEDURE insrec(pempno emp.empno%TYPE,pename emp.ename%TYPE,
      pjob emp.job%TYPE,pmgr emp.mgr%TYPE,
      phiredate emp.hiredate%TYPE,psal emp.sal%TYPE,
      pcomm emp.comm%TYPE,pdeptno emp.deptno%TYPE)
 IS
 BEGIN
  INSERT INTO emp VALUES(pempno,pename,pjob,pmgr,phiredate,
        psal,pcomm,pdeptno);
  DBMS_OUTPUT.PUT_LINE(''''1 record is created.'''');
 END insrec;
 PROCEDURE delrec(pempno IN NUMBER)
 IS
 BEGIN
  DELETE FROM emp WHERE empno=pempno;
  DBMS_OUTPUT.PUT_LINE(''''1 record is deleted.'''');
 END delrec;
 FUNCTION selsal(pempno NUMBER) RETURN NUMBER
 IS
  vTotalSal NUMBER;
 BEGIN
  SELECT NVL(sal,0)+NVL(comm,0) INTO vTotalSal
  FROM emp
  WHERE empno=pempno;
  RETURN vTotalSal;
 END selsal;
 FUNCTION seldname(pempno NUMBER) RETURN VARCHAR2
 IS
  vdname dept.dname%TYPE;
 BEGIN
  SELECT dname INTO vdname
  FROM emp,dept
  WHERE empno=pempno AND emp.deptno=dept.deptno;
  RETURN vdname;
 END seldname;
END;
/

--执行包中的过程和函数
EXECUTE emppack.insrec(1111,''''Goldens'''',''''MANAGER'''',7698,''''2003-01-18'''',2000,400,30);
EXECUTE emppack.delrec(1111);

DECLARE
 salary NUMBER;
BEGIN
 salary:=emppack.selsal(7369);
 DBMS_OUTPUT.PUT_LINE(''''Total Salary is ''''||salary);
END;
/
DECLARE
 department VARCHAR2(30);
BEGIN
 department:=emppack.seldname(7369);
 DBMS_OUTPUT.PUT_LINE(''''Department name is ''''||department);
END;
/

Q.编写一个数据库触发器以显示当任何时候雇员加薪时的加薪情况。
A.
CREATE OR REPLACE TRIGGER emp_SalUp
AFTER UPDATE OF sal ON emp
FOR EACH ROW
DECLARE
 vsal NUMBER;
BEGIN
 vsal:=NVL(:NEW.sal,0)-NVL(:OLD.sal,0);
 IF vsal<=0 THEN
  RAISE_APPLICATION_ERROR(-20001,''''Increased Salary is not zero and littler than zero'''');
 END IF;
END;
/
Q.编写一个数据库触发器，它允许用户只在上午9.00到下午5.00之间执行DML任务。
A.
CREATE OR REPLACE TRIGGER operate_time_limited
BEFORE INSERT OR UPDATE OR DELETE ON emp
--FOR EACH ROW
DECLARE
 vtime NUMBER;
BEGIN
 vtime:=TO_NUMBER(TO_CHAR(SYSDATE,''''HH24''''));
 IF vtime NOT BETWEEN 9 AND 17 THEN
  RAISE_APPLICATION_ERROR(-20444,''''Sorry!Not Except 9AM and 5PM.'''');
 END IF;
END;
/
Q.编写一个数据为触发器以检查某个组织中不能有两个总裁。
A.
CREATE OR REPLACE TRIGGER check_president
BEFORE INSERT OR UPDATE ON emp
FOR EACH ROW
WHEN (UPPER(NEW.job)=''''PRESIDENT'''')
DECLARE
 vCount NUMBER;
BEGIN
 SELECT COUNT(job) INTO vCount
 FROM emp
 WHERE UPPER(job)=''''PRESIDENT'''';  --把总统的个数统计出来，当为0时，变量值为0
 
 IF vCount>0 THEN
  RAISE_APPLICATION_ERROR(-20444,''''Sorry!Can''''''''t have two President.'''');
 END IF;
END;
/
Q.编写一个数据库触发器，当任何时候某个部门从"dept"中删除时，该触发器将从"emp"表中删除该部门的所有雇员。
A.
CREATE OR REPLACE TRIGGER del_emp_deptno
BEFORE DELETE ON dept
FOR EACH ROW
BEGIN
 DELETE FROM emp WHERE deptno=:OLD.deptno; 
END;
/
----8i下通过。资料来自ACCP

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