一、利用控制語句列印九九乘法表
set severout on//使控制檯能夠進行輸出
declare//變數宣告
：=//給變數賦值
||//連線符相當於JAVA中的連線符“+”沒有實際含義
exit//退出迴圈

set serverout on;
declare sum1 number :=0;
temp varchar2(500);
s number :=0;
begin
for i in 1..9 loop
temp := '';
s:=(10-i);
for j in 1 .. s
loop
sum1 := (10-i) * (10-j);
temp := temp||to_char(10-j) || ' * '
 
 ||to_char(10-i) ||' = ' ||to_char(sum1) ||' ';
end loop;
dbms_output.put_line(temp );
end loop;
end;

二、其他的一些操作

set serverout on;
declare n number:=1;
        v varchar2(20):='world';
begin
  dbms_output.put_line('hello'||n||v);
end;


set serverout on;
declare emp_count number:=1;

begin
  select
 
 count(*) into emp_count from emp where sal>=3000;
  if emp_count=1 then
     dbms_output.put_line('有1個員工的薪資大於等於3000');
  else if emp_count>1 then
    dbms_output.put_line('有超過一個員工的薪資大於等於3000');
  else
    dbms_output.put_line('沒有員工的薪資大於等於3000');
  end if;
  end if;
end;

set serverout on;
declare emp_count number:=1
 
;

begin
   select count(*) into emp_count from emp where sal>=3000;
   case emp_count
     when 0 then dbms_output.put_line('沒有員工的薪資大於等於3000');
     when 1 then dbms_output.put_line('有1個員工的薪資大於等於3000');
     when 2 then dbms_output.put_line('有2個員工的薪資大於等於3000');
     when 3 then dbms_output.put_line('有3個員工的薪資大於等於3000');
     else
       dbms_output.put_line('有超過3員工的薪資大於等於3000');
    end case;
end;



set serverout on;
declare g_id number:=2;
        g_losal number;
        g_hisal number;
begin
  loop
    if(g_id>4) then
       exit;
    end if;

    select losal,hisal into g_losal,g_hisal from salgrade where grade=g_id;
    dbms_output.put_line(g_id||'最低薪資'||g_losal||'最高薪資'||g_hisal);

    g_id:=g_id+1;
  end loop;
end;