LISTAGG内的RTRIM？

Question

美好的一天。我正在编写一个使用LISTAGG并返回结果的查询。这是我到目前为止的代码。

   select 
    listagg(rtrim(shop_cde, 1), ', ') within group (order by shop_cde) col1,
    business_cde
    from mytable
    group by business_cde

我希望这会返回结果，对其进行汇总，并在shop_cde的右边减去1个字符。但是，似乎没有修剪发生。 Shop_cde仍完整显示。有人知道如何在LISTAGG函数中进行TRIM吗？

Answer 1

trim()函数通常用于删除开头和结尾的空格（尽管您也可以删除其他字符）。

如果要舍弃最后一个字符，请使用substr()：

select listagg(substr(shop_cde, 1, length(shop_cde) - 1), ', ') within group (order by shop_cde) col1,
       business_cde
from mytable
group by business_cde

Answer 2

如果要从右侧删除字符的给定数字，请使用substr；如果要给定字符的给定数字，请使用rtrim。 / em>已消除。分别删除左侧的substr(..., 2)和ltrim。

   select 
    listagg(substr(shop_cde, -1), ', ') within group (order by shop_cde) col1,
    business_cde
    from mytable
    group by business_cde

Answer 3

您应该使用rtrim（listagg（....））

select 
rtrim(listagg(shop_cde, ', ') within group (order by shop_cde) ) col1,
business_cde
from mytable
group by business_cde