java-oracle中几十个实用的PL/SQL

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，如果所增加的薪水大于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;
/

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