Question

这是代码

 declare
 a integer;
 begin
  select to_char(to_date('1/1/2017 ','mm/dd/yyyy') + level -1) into a from dual 
   connect by level <=365;
   for a in 1..3 loop
  dbms_output.put_line(a);
  end loop;
 end;

发生错误的是精确获取请求更多行数请帮忙

Answer 1

您正尝试在缩放器变量中获取多个值。

试试这个：

begin
    for i in (select to_char(to_date('1/1/2017 ','mm/dd/yyyy') + level -1) col
                    from dual 
                    connect by level <=365) loop
        for j in 1..3 loop
            dbms_output.put_line(i.col);
        end loop;
    end loop;
end; 
/

Answer 2

首先，请注意您宣布＆＃34; a＆＃34;变量为整数但随后为其分配varchar2。 2，我正在测试你的代码，似乎level <= 365存在问题。我将其更改为level = 365，它似乎返回了预期的结果。

declare
 a integer;
 begin
  select to_char(to_date('1/1/2017 ','mm/dd/yyyy') + level -1) into a from dual 
  -- connect by level <= 365;
  connect by level = 365;
   for a in 1..3 loop
  dbms_output.put_line(a);
  end loop;
 end;

如何在oracle中打印三次特定的select语句？

2 个答案: