1、自动以输入任意员工编号，输出该员工编号，输出该员工变号、姓名、工资、部门、所在地

declare 
  -- Local variables here
  empno integer;
  ename nvarchar2(20);
  sal float;
  dname nvarchar2(20);
  loc nvarchar2(20);
  i integer;
begin
  -- Test statements here
  select empno,ename,sal,dname,loc into empno,ename,sal,dname,loc from emp join dept on emp.deptno= dept.deptno where empno = &i;
  dbms_output.put_line(empno||' '||ename||' '||sal||' '||dname||' '||loc);
end;

2、自定义输入任意员工编号；如果该员工入职时间大于10年，则奖金加1w，如果该员工入职时间大于5年，奖金加5000，否则不加。最终输出员工编号、姓名、入职时间、原奖金、现奖金

declare 
  -- Local variables here
  empno integer;
  ename nvarchar2(20);
  comm_before integer;
  comm_after integer;
  hiredate date;
  i integer;
  t integer;
begin
  -- Test statements here
  select empno,ename,hiredate,comm into empno,ename,hiredate,comm_before from emp join dept on emp.deptno= dept.deptno where empno = &i;
  select months_between(sysdate,hiredate) into t from emp where empno = &i;
  if t>=120 then
     update emp set comm=comm+10000 where empno=i;
  elsif t>=60 and t<120 then
     update emp set comm=comm+5000 where empno=i;
  elsif t<60 then
     update emp set comm=comm where empno=i;
  end if;
  select comm into comm_after from emp where empno=i;  
  dbms_output.put_line(empno||' '||ename||' '||hiredate||' '||comm_before||' '||comm_after);
end;
/

3、对每位员工的薪水进行判断，如果该员工薪水高于其所在部门薪水，则将其薪水减50元，否则不变

declare 
  -- Local variables here
  myempno emp.empno%type := '&no';
  empeg scott.emp%rowtype;
  avgSal number;
  saleg number;
  depteg scott.dept%rowtype;
begin
  -- Test statements here
  select * into empeg from scott.emp where emp.empno = myempno;
  select * into depteg from scott.dept where dept.deptno=empeg.deptno;
  select avg(sal) into avgSal from scott.emp group by emp.deptno having emp.deptno=empeg.deptno;
  select emp.sal into saleg from emp where emp.empno = myempno;
  if empeg.sal>avgSal then
    saleg := saleg-50;
  end if;
  dbms_output.put_line('员工编号：' || myempno || '姓名：' || empeg.ename || '之前工资：' || empeg.sal || '现在工资：' || saleg);
end;
/

4、创建一个存储过程，实现：通过输入员工编号查看员工姓名、工资、奖金；
1.1 如果输入的编号不存在，则进行异常处理；
1.2 如果工资高于4000，输出工资高于4000；
1.3 如果奖金没有或为0，进行异常提示处理

create or replace procedure procemp(myempno in int) is
  -- Local variables here
  empeg scott.emp%rowtype;
  ifExist number;
begin
  -- Test statements here
  select * into empeg from scott.emp where emp.empno = myempno;
  select count(1) into ifExist from scott.emp where emp.empno = myempno;
  if ifExist=0 then
     dbms_output.put_line('错误！编号不存在');
  elsif empeg.sal>4000 then
     dbms_output.put_line('工资高于4000');
  elsif nvl(empeg.comm,0)=0 then
     dbms_output.put_line('奖金为0');
  else null;
  end if;
    dbms_output.put_line('员工编号：' || myempno || ' 姓名：' || empeg.ename || ' 工资：' || empeg.sal || ' 奖金：' || empeg.comm);
end procemp;