Oracle 循环查询并将结果导出到excel的脚本

我使用以下脚本循环查询并将结果导出到excel文件中

begin
    for months in 0..12 loop
      data_dump( query_in     => 'select count(*) from reservation where trunc(update_date) between (select add_months(TRUNC(SYSDATE), -(months) ) from dual) and (select add_months(TRUNC(SYSDATE),-(months+1)) from dual)',
                               file_in      => 'excel_'||months||'.csv',
                              directory_in => 'C:\Users\Administrator\Desktop\test',
                              delimiter_in => '|' );
     end loop;
end;

数据转储是将结果导出到excel文件的过程

begin
    for months in 0..12 loop
      data_dump( query_in     => 'select count(*) from reservation where trunc(update_date) between (select add_months(TRUNC(SYSDATE), -(months) ) from dual) and (select add_months(TRUNC(SYSDATE),-(months+1)) from dual)',
                               file_in      => 'excel_'||months||'.csv',
                              directory_in => 'C:\Users\Administrator\Desktop\test',
                              delimiter_in => '|' );
     end loop;
end;

我试图使我使用的公式动态如下：

(select add_months(TRUNC(SYSDATE), -(months) ) from dual)

months

变量来自循环，但当我运行查询时，它会出错

---

如果您能提供语法方面的帮助，我们将不胜感激。

我认为问题在于：

'select count(*) 
from reservation 
where trunc(update_date) between 
(select add_months(TRUNC(SYSDATE), -(months) ) from dual) 
and (select add_months(TRUNC(SYSDATE),-(months+1)) from dual)'

在你的例子中，“月”只是文本。您需要以这种方式更改表达式：

'select count(*) 
from reservation 
where trunc(update_date) between 
(select add_months(TRUNC(SYSDATE), -('|| months ||') ) from dual) 
and (select add_months(TRUNC(SYSDATE),-('|| months+1 ||')) from dual)'

---

我认为问题在于：

'select count(*) 
from reservation 
where trunc(update_date) between 
(select add_months(TRUNC(SYSDATE), -(months) ) from dual) 
and (select add_months(TRUNC(SYSDATE),-(months+1)) from dual)'

在你的例子中，“月”只是文本。您需要以这种方式更改表达式：

'select count(*) 
from reservation 
where trunc(update_date) between 
(select add_months(TRUNC(SYSDATE), -('|| months ||') ) from dual) 
and (select add_months(TRUNC(SYSDATE),-('|| months+1 ||')) from dual)'

---

尝试像“| |月| | |”这样的月份动态获取值

尝试像“| |月| |”这样的月份动态获取值

请提供错误。请提供错误。