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

              E

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