/*
例項1：統計每年入職的員工個數。
可能sql：
select to_char(hiredate,』yyyy』) from emp;
*/ set serveroutput on
declare
cursor cemp is select to_char(hiredate,』yyyy』) from emp;
phiredate varchar2(4);
–計數器
count80 number := 0;
count81 number := 0;
count82 number := 0;
count87 number := 0;
begin
open cemp;
loop
–取乙個員工
fetch cemp into phiredate;
exit when cemp%notfound;
--判斷
if phiredate = '1980' then count80:=count80+1;
elsif phiredate = '1981' then count81:=count81+1;
elsif phiredate = '1982' then count82:=count82+1;
else count87 := count87+1;
end if;
close cemp;
–輸出
dbms_output.put_line(『total:』||(count80+count81+count82+count87));
dbms_output.put_line(『1980:』|| count80);
dbms_output.put_line(『1981:』|| count81);
dbms_output.put_line(『1982:』|| count82);
dbms_output.put_line(『1987:』|| count87);
end;
//*
為員工長工資。從最低工資調起每人長10％，但工資總額不能超過5萬元,
請計算長工資的人數和長工資後的工資總額，並輸出輸出長工資人數及工資總額。
可能的sql:
員工: select empno,sal from emp order by sal;
長工資後的工資總額:1. 對sal進行累加: 新的工資總額=舊的工資 + sal*0.1;
2. sum(sal): 查詢資料庫
練習： 工資不能超過5w
*/ set serveroutput on
declare
–員工
cursor cemp is select empno,sal from emp order by sal;
pempno emp.empno%type;
psal emp.sal%type;
–長工資的人數
countemp number := 0;
–工資總額
saltotal number;
begin
–漲前工資總額
select sum(sal) into saltotal from emp;
open cemp;
loop
–工資總額》5w
exit when saltotal > 50000;
–取乙個員工
fetch cemp into pempno,psal;
exit when cemp%notfound;
--漲工資
update emp set sal=sal*1.1 where empno=pempno;
--人數
countemp := countemp +1;
--工資總額
saltotal := saltotal + psal * 0.1;
close cemp;
commit;
–輸出
dbms_output.put_line(『長工資的人數:』|| countemp);
dbms_output.put_line(『工資總額:』|| saltotal);
end;
//*
用pl/sql語言編寫一程式，實現按部門分段（6000以上、(6000，3000)、3000元以下)
統計各工資段的職工人數、以及各部門的工資總額(工資總額中不包括獎金)
sql語句：
部門: select deptno from dept;
員工的工資: select sal from emp where deptno=???
工資總額: select sum(sal) from emp where deptno=???
*/ set serveroutput on
declare
–部門
cursor cdept is select deptno from dept;
pdno dept.deptno%type;
–部門中的員工
cursor cemp(dno number) is select sal from emp where deptno=dno;
psal emp.sal%type;
–各個段的人數
count1 number;count2 number;count3 number;
–部門的工資總額
saltotal number;
begin
open cdept;
loop
–取部門
fetch cdept into pdno;
exit when cdept%notfound;
--初始化
count1 :=0;count2:=0;count3:=0;
select sum(sal) into saltotal from emp where deptno=pdno;
--取部門中的員工
open cemp(pdno);
loop
fetch cemp into psal;
exit when cemp%notfound;
--判斷
if psal<3000 then count1:=count1+1;
elsif psal>=3000 and psal<6000 then count2:=count2+1;
else count3:=count3+1;
end if;
end loop;
close cemp;
--儲存當前部門
insert into msg1 values(pdno,count1,count2,count3,nvl(saltotal,0));
close cdept;
commit;
dbms_output.put_line(『完成』);
end;
/
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