几十个实用的PL/SQL
第一阶段
Q.编写一个PL/SQL程序块以显示所给出雇员编号的雇员的具体信息。
A.
DECLARE
erec emp%ROWTYPE;
BEGIN
SELECT * INTO erec FROM emp WHERE empno=&雇员编号;
DBMS_OUTPUT.PUT_LINE(´EmpNo´ ´ ´ ´Ename´ ´ ´ ´Job´ ´ ´ ´Manager´ ´ ´ ´HireDate´ ´ ´ ´Salary´ ´ ´ ´Commision´ ´ ´ ´DeptNo´);
DBMS_OUTPUT.PUT_LINE(erec.ename ´ ´ erec.job ´ ´ erec.mgr ´ ´ erec.hiredate ´ ´ erec.sal ´ ´ erec.comm ´ ´ erec.deptno);
END;
/
Q.编写一个PL/SQL程序块以计算某个雇员的年度薪水总额。
A.
DECLARE
esal NUMBER;
eename emp.ename%TYPE;
BEGIN
SELECT (NVL(sal,0)+NVL(comm,0))*12,ename INTO esal,eename FROM emp WHERE empno=&雇员编号;
DBMS_OUTPUT.PUT_LINE(eename ´´´s Years Salary is ´ esal);
END;
/
Q.按下列加薪比执行：
Deptno Raise(%age)
10 5%
20 10%
30 15%
40 20%
加薪的百分比是以他们现有的薪水为根据的。写一PL/SQL以对指定雇员加薪。
A.
DECLARE
vcounter NUMBER:=10;
vraise NUMBER;
BEGIN
LOOP
EXIT WHEN vcounter>40;
UPDATE emp set sal=NVL(sal,0)+NVL(sal,0)*0.05 WHERE deptno=vcounter;
vcounter:=vcounter+10;
END LOOP;
END;
/
Q.编写一PL/SQL以向"emp"表添加10个新雇员编号。
（提示：假如当前最大的雇员编号为7900，则新雇员编号将为7901到7910）
A.
DECLARE
vcounter NUMBER;
BEGIN
SELECT MAX(empno) INTO vcounter FROM emp;
FOR i IN 1..10
LOOP
vcounter:=vcounter+1;
INSERT INTO emp(empno) VALUES(vcounter);
END LOOP;
END;
/
Q.只使用一个变量来解决实验课作业4。
A
DECLARE
erec emp%ROWTYPE;
-- vraise NUMBER;
BEGIN
SELECT * INTO erec
FROM emp
WHERE ename=´&ename´;
IF erec.job=´CLERK´ THEN
UPDATE emp SET sal=sal+500 WHERE empno=erec.empno;
ELSIF erec.job=´SALESMAN´ THEN
UPDATE emp SET sal=sal+1000 WHERE empno=erec.empno;
ELSIF erec.job=´ANALYST´ THEN
UPDATE emp SET sal=sal+1500 WHERE empno=erec.empno;
ELSE
UPDATE emp SET sal=sal+2000 WHERE empno=erec.empno;
END IF;
-- UPDATE emp SET sal=sal+vraise WHERE empno=erec.empno;
-- DBMS_OUTPUT.PUT_LINE(vraise);
END;
/
Q.接受两个数相除并且显示结果。假如第二个数为0，则显示消息"DIVIDE BY ZERO"。
A.
DECLARE
num1 NUMBER;
num2 NUMBER;
BEGIN
num1:=#
num2:=#
DBMS_OUTPUT.PUT_LINE(num1 ´/´ num2 ´ is ´ num1/num2);
EXCEPTION
WHEN ZERO_DIVIDE THEN
DBMS_OUTPUT.PUT_LINE(´Didn´´t your teacher tell you not to DIVIDE BY ZERO?´);
END;
/
第二阶段
Q.编写一个PL/SQL程序块，对名字以"A"或"S"开始的所有雇员按他们的基本薪水的10%加薪。
A.
DECLARE
CURSOR c1 IS
SELECT * FROM emp WHERE SUBSTR(ename,1,1)=´A´ OR SUBSTR(ename,1,1)=´S´ FOR UPDATE OF sal;
BEGIN
FOR i IN c1
LOOP
UPDATE emp SET sal=NVL(sal,0)+NVL(sal,0)*0.1 WHERE CURRENT OF c1;
END LOOP;
END;
/
Q.编写一PL/SQL，对所有的"销售员"(SALESMAN)增加佣金500.
A.
DECLARE
CURSOR c1 IS
SELECT * FROM emp WHERE job=´SALESMAN´ FOR UPDATE OF sal;
BEGIN
FOR i IN c1
LOOP
UPDATE emp SET sal=NVL(sal,0)+500 WHERE CURRENT OF c1;
END LOOP;
END;
/
Q.编写一PL/SQL，以提升两个资格最老的"职员"为"高级职员"。（工作时间越长，优先级越高）
A.
DECLARE
CURSOR c1 IS
SELECT * FROM emp WHERE job=´CLERK´ ORDER BY hiredate FOR UPDATE OF job;
--升序排列，工龄长的在前面
BEGIN
FOR i IN c1
LOOP
EXIT WHEN c1%ROWCOUNT>2;
DBMS_OUTPUT.PUT_LINE(i.ename);
UPDATE emp SET job=´HIGHCLERK´ WHERE CURRENT OF c1;
END LOOP;
END;
/
Q.编写一PL/SQL，对所有雇员按他们基本薪水的10%加薪，假如所增加的薪水大于5000，则取消加薪。
A.
DECLARE
CURSOR c1 IS SELECT * FROM emp FOR UPDATE OF sal;
BEGIN
FOR i IN c1
LOOP
IF (i.sal+i.sal*0.1)<=5000 THEN
UPDATE emp SET sal=sal+sal*0.1 WHERE CURRENT OF c1;
DBMS_OUTPUT.PUT_LINE(i.sal);
END IF;
END LOOP;
END;
/
Q.显示EMP中的第四条记录。
A.
DECLARE
CURSOR c1 IS SELECT * FROM emp;
BEGIN
FOR i IN c1
LOOP
IF c1%ROWCOUNT=4 THEN
DBMS_OUTPUT.PUT_LINE(i. EMPNO ´ ´ i.ENAME ´ ´ i.JOB ´ ´ i.MGR ´ ´ i.HIREDATE ´ ´ i.SAL ´ ´ i.COMM ´ ´ i.DEPTNO);
EXIT;
END IF;
END LOOP;
END;
/
第三阶段
Q.使用REF游标显示"EMP"表中的值。
A.
DECLARE
TYPE emprectyp IS RECORD
(
EMPNO emp.empno%TYPE,
ENAME emp.ename%TYPE,
JOB emp.job%TYPE,
MGR emp.mgr%TYPE,
HIREDATE emp.hiredate%TYPE,
SAL emp.sal%TYPE,
COMM emp.comm%TYPE,
DEPTNO emp.deptno%TYPE
);
TYPE emp_cursor IS REF CURSOR RETURN emp%ROWTYPE;
vemp_cur EMP_CURSOR;
vemp_rec EMPRECTYP;
BEGIN
OPEN vemp_cur FOR SELECT * FROM emp;
LOOP
FETCH vemp_cur INTO vemp_rec;
EXIT WHEN vemp_cur%NOTFOUND;
DBMS_OUTPUT.PUT(vemp_rec.empno´ ´vemp_rec.ename´ ´vemp_rec.job);
DBMS_OUTPUT.PUT(vemp_rec.mgr´ ´vemp_rec.hiredate´ ´vemp_rec.sal);
DBMS_OUTPUT.PUT_line(vemp_rec.comm´ ´vemp_rec.deptno);
END LOOP;
CLOSE vemp_cur;
END;
/
Q.从"EMP"中获得值送到PL/SQL表，将PL/SQL表中的薪水值增加500，并向用户显示增加的薪水及其他具体信息。
A.
DECLARE
TYPE emprec IS RECORD
(
EMPNO emp.empno%TYPE,
ENAME emp.ename%TYPE,
JOB emp.job%TYPE,
MGR emp.mgr%TYPE,
HIREDATE emp.hiredate%TYPE,
SAL emp.sal%TYPE,
COMM emp.comm%TYPE,
DEPTNO emp.deptno%TYPE
);
i BINARY_INTEGER:=1;
TYPE emp_tab IS TABLE OF EMPREC INDEX BY binary_integer;
vemp EMP_TAB;
CURSOR c1 IS SELECT * FROM emp;
BEGIN
FOR x IN c1
LOOP
vemp(i).empno:=x.empno;
vemp(i).ename:=x.ename;
vemp(i).job:=x.job;
vemp(i).mgr:=x.mgr;
vemp(i).hiredate:=x.hiredate;
vemp(i).sal:=x.sal+500;
vemp(i).comm:=x.comm;
vemp(i).deptno:=x.deptno;
i:=i+1;
END LOOP;
FOR j IN 1..i-1
LOOP
DBMS_OUTPUT.PUT(vemp(j).empno´ ´vemp(j).ename´ ´vemp(j).job);
DBMS_OUTPUT.PUT(vemp(j).mgr´ ´vemp(j).hiredate´ ´vemp(j).sal);
DBMS_OUTPUT.PUT_line(vemp(j).comm´ ´vemp(j).deptno);
END LOOP;
END;
/
Q.一旦将值送到PL/SQL表后，尝试在PL/SQL表中插入新记录并且删除某些现有的记录。
A.
DECLARE
TYPE emprec IS RECORD
(
EMPNO emp.empno%TYPE,
ENAME emp.ename%TYPE,
JOB emp.job%TYPE,
MGR emp.mgr%TYPE,
HIREDATE emp.hiredate%TYPE,
SAL emp.sal%TYPE,
COMM emp.comm%TYPE,
DEPTNO emp.deptno%TYPE
);
i BINARY_INTEGER:=1;
TYPE emp_tab IS TABLE OF EMPREC INDEX BY binary_integer;
vemp EMP_TAB;
CURSOR c1 IS SELECT * FROM emp;
BEGIN
FOR x IN c1
LOOP
vemp(i).empno:=x.empno;
vemp(i).ename:=x.ename;
vemp(i).job:=x.job;
vemp(i).mgr:=x.mgr;
vemp(i).hiredate:=x.hiredate;
vemp(i).sal:=x.sal;
vemp(i).comm:=x.comm;
vemp(i).deptno:=x.deptno;
i:=i+1;
END LOOP;
-- FOR j IN 1..i-1
-- LOOP
-- DBMS_OUTPUT.PUT(vemp(j).empno´ ´vemp(j).ename´ ´vemp(j).job);
-- DBMS_OUTPUT.PUT(vemp(j).mgr´ ´vemp(j).hiredate´ ´vemp(j).sal);
-- DBMS_OUTPUT.PUT_line(vemp(j).comm´ ´vemp(j).deptno);
-- END LOOP;
--插入记录
DBMS_OUTPUT.PUT_LINE(´插入记录:´);
vemp(i).empno:=1000;
vemp(i).ename:=´Goldens´;
vemp(i).job:=´Software´;
vemp(i).mgr:=null;
vemp(i).hiredate:=´2003-01-04´;
vemp(i).sal:=8888;
vemp(i).comm:=10;
vemp(i).deptno:=10;
FOR j IN 1..i
LOOP
DBMS_OUTPUT.PUT(vemp(j).empno´ ´vemp(j).ename´ ´vemp(j).job);
DBMS_OUTPUT.PUT(vemp(j).mgr´ ´vemp(j).hiredate´ ´vemp(j).sal);
DBMS_OUTPUT.PUT_line(vemp(j).comm´ ´vemp(j).deptno);
END LOOP;
--删除第5、6条记录
DBMS_OUTPUT.PUT_LINE(´删除第5、6条记录:´);
FOR j IN 5..i-2
LOOP
vemp(j).empno:=vemp(j+2).empno;
vemp(j).ename:=vemp(j+2).ename;
vemp(j).job:=vemp(j+2).job;
vemp(j).mgr:=vemp(j+2).mgr;
vemp(j).hiredate:=vemp(j+1).hiredate;
vemp(j).sal:=vemp(j+2).sal;
vemp(j).comm:=vemp(j+2).comm;
vemp(j).deptno:=vemp(j+2).deptno;
END LOOP;
vemp(i-1).empno:=null;
vemp(i-1).ename:=null;
vemp(i-1).job:=null;
vemp(i-1).mgr:=null;
vemp(i-1).hiredate:=null;
vemp(i-1).sal:=null;
vemp(i-1).comm:=null;
vemp(i-1).deptno:=null;
vemp(i).empno:=null;
vemp(i).ename:=null;
vemp(i).job:=null;
vemp(i).mgr:=null;
vemp(i).hiredate:=null;
vemp(i).sal:=null;
vemp(i).comm:=null;
vemp(i).deptno:=null;
FOR j IN 1..i-2
LOOP
DBMS_OUTPUT.PUT(vemp(j).empno´ ´vemp(j).ename´ ´vemp(j).job);
DBMS_OUTPUT.PUT(vemp(j).mgr´ ´vemp(j).hiredate´ ´vemp(j).sal);
DBMS_OUTPUT.PUT_line(vemp(j).comm´ ´vemp(j).deptno);
END LOOP;
END;
/
第四阶段
Q.编写一过程以接受用户输入的三个部门编号并显示其中两个部门编号的部门名称。
A.
CREATE OR REPLACE PROCEDURE DeptName(no1 dept.deptno%TYPE,no2 dept.deptno%TYPE,no3 dept.deptno%TYPE) AS
vflag NUMBER;
vdeptno1 dept.deptno%TYPE;
vdeptno2 dept.deptno%TYPE;
vdname1 dept.dname%TYPE;
vdname2 dept.dname%TYPE;
BEGIN
vflag:=TO_NUMBER(TO_CHAR(SYSDATE,´SS´));
IF (vflag>=1 AND vflag<=10) OR (vflag>=50 AND vflag<60) THEN
SELECT deptno,dname INTO vdeptno1,vdname1 FROM dept WHERE deptno=no1;
SELECT deptno,dname INTO vdeptno2,vdname2 FROM dept WHERE deptno=no2;
ELSIF (vflag>=11 AND vflag<=20) OR (vflag>=40 AND vflag<50) THEN
SELECT deptno,dname INTO vdeptno1,vdname1 FROM dept WHERE deptno=no1;
SELECT deptno,dname INTO vdeptno2,vdname2 FROM dept WHERE deptno=no3;
ELSE
SELECT deptno,dname INTO vdeptno1,vdname1 FROM dept WHERE deptno=no2;
SELECT deptno,dname INTO vdeptno2,vdname2 FROM dept WHERE deptno=no3;
END IF;
DBMS_OUTPUT.PUT_LINE(´部门编号:´vdeptno1 ´ ´´部门名称:´ vdname1);
DBMS_OUTPUT.PUT_LINE(´部门编号:´vdeptno2 ´ ´´部门名称:´ vdname2);
END;
/
EXECUTE DeptName(10,20,30);
Q.编写一过程以显示所指定雇员名的雇员部门名和位置。
A.
CREATE OR REPLACE PROCEDURE DeptMesg(pename emp.ename%TYPE,pdname OUT dept.dname%TYPE,ploc OUT dept.loc%TYPE) AS
BEGIN
SELECT dname,loc INTO pdname,ploc
FROM emp,dept
WHERE emp.deptno=dept.deptno AND emp.ename=pename;
END;
/
VARIABLE vdname VARCHAR2(14)
VARIABLE vloc VARCHAR2(13)
EXECUTE DeptMesg(´SMITH´,:vdname,:vloc);
PRINT vdname vloc;
Q.编写一个给非凡雇员加薪10%的过程，这之后，检查假如已经雇佣该雇员超过60个月，则给他额外加薪3000.
A.
CREATE OR REPLACE PROCEDURE Raise_Sal(no IN NUMBER) AS
vhiredate DATE;
vsal emp.sal%TYPE;
BEGIN
SELECT hiredate,sal INTO vhiredate,vsal FROM emp WHERE empno=no;
IF MONTHS_BETWEEN(SYSDATE,vhiredate)>60 THEN
vsal:=NVL(vsal,0)*1.1+3000;
ELSE
vsal:=NVL(vsal,0)*1.1;
END IF;
UPDATE emp SET sal=vsal WHERE empno=no;
END;
/
VARIABLE no NUMBER
BEGIN
:no:=7369;
END;
/
EXECUTE Raise_Sal(:no)
SELECT empno,ename,sal,comm,hiredate FROM emp WHERE empno=:no;
Q.编写一个函数以检查所指定雇员的薪水是否有效范围内。不同职位的薪水范围为：
Designation Raise
Clerk 1500-2500
Salesman 2501-3500
Analyst 3501-4500
Others 4501 and above.
假如薪水在此范围内，则显示消息"Salary is OK"，否则，更新薪水为该范围内的最水值。
A.
CREATE OR REPLACE FUNCTION Sal_Level(no emp.empno%TYPE) RETURN CHAR AS
vjob emp.job%TYPE;
vsal emp.sal%TYPE;
vmesg CHAR(50);
BEGIN
SELECT job,sal INTO vjob,vsal FROM emp WHERE empno=no;
IF vjob=´CLERK´ THEN
IF vsal>=1500 AND vsal<=2500 THEN
vmesg:=´Salary is OK.´;
ELSE
vsal:=1500;
vmesg:=´Have updated your salary to ´TO_CHAR(vsal);
END IF;
ELSIF vjob=´SALESMAN´ THEN
IF vsal>=2501 AND vsal<=3500 THEN
vmesg:=´Salary is OK.´;
ELSE
vsal:=2501;
vmesg:=´Have updated your salary to ´TO_CHAR(vsal);
END IF;
ELSIF vjob=´ANALYST´ THEN
IF vsal>=3501 AND vsal<=4500 THEN
vmesg:=´Salary is OK.´;
ELSE
vsal:=3501;
vmesg:=´Have updated your salary to ´TO_CHAR(vsal);
END IF;
ELSE
IF vsal>=4501 THEN
vmesg:=´Salary is OK.´;
ELSE
vsal:=4501;
vmesg:=´Have updated your salary to ´TO_CHAR(vsal);
END IF;
END IF;
UPDATE emp SET sal=vsal WHERE empno=no;
RETURN vmesg;
END;
/
DECLARE
vmesg CHAR(50);
vempno emp.empno%TYPE;
BEGIN
vempno:=&empno;
vmesg:=Sal_Level(vempno);
DBMS_OUTPUT.PUT_LINE(vmesg);
END;
/
--SELECT empno,ename,sal,comm,hiredate FROM emp WHERE empno=:no;
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;
