Oracle三种循环(For、While、Loop)实现九九乘法表

declare
i int:=0;
j int:=0;
begin
for i in 1..9 loop
  for j in 1..i loop
    Dbms_Output.put(i||''||j||'='||ij);
    dbms_output.put(' ');
  end loop;
  dbms_output.new_line;
end loop;
end;

declare
i int:=1;
j int:=1;
begin
 while i<=9 loop
  j:=1;
  while j<=i loop
   Dbms_Output.put(i||''||j||'='||ij);
   dbms_output.put(' ');
   j:=j+1;
   end loop;
    dbms_output.new_line;
   i:=i+1;
  end loop;
  end;

declare 
i int:=1;
j int:=1;
begin
loop
loop
  Dbms_Output.put(i||''||j||'='||ij);
  dbms_output.put(' ');
 j:=j+1;
 exit when j>i;
 end loop;
 dbms_output.put_line('');
 i:=i+1;
 j:=1;
 exit when i>9;
 end loop;
 end;