db2中的Listagg替代 [英] Listagg alternative in db2

问题描述

我的客户正在使用没有listagg功能的db2数据库，但我需要以某种方式聚合一个字段中的主键信息。

My customer is using db2 database without listagg function, but I need to somehow aggregate the primary key information within one field.

现在（对于Oracle）我是使用它作为更大的查询的一部分：

Right now (for Oracle) I am using this as a part of bigger query:

SELECT LISTAGG(COLUMN_NAME || ':' || CONTENT, ',') 
WITHIN GROUP (ORDER BY COLUMN_NAME || ':' || CONTENT) 
FROM TABLE
WHERE ROW_IDENTIFIER_ID = I.REC_ID AND I.TABLE_RESULT_ID = T.REC_ID

有一种替代方法来获取db2数据库中的dbarch数据库的结果，在DB2之前从版本9.7修复包4 ¹ ？

It there an alternative way to get result of listagg function in db2 database before DB2 as of version 9.7 Fix Pack 4¹ ?

我的客户数据库的版本：
Linux - 企业版服务器版本9.7，版本号08060107

我通过执行这些选项得到它： p>

Version of my customer's database: Linux - Enterprise server edition 9.7, release number 08060107
I got it by executing these selects:

SELECT * FROM TABLE(SYSPROC.ENV_GET_INST_INFO()) AS SYSTEMINFO;
SELECT * FROM TABLE(SYSPROC.ENV_GET_PROD_INFO()) AS SYSTEMINFO;
SELECT * FROM TABLE(SYSPROC.ENV_GET_SYS_INFO()) AS SYSTEMINFO;

我承认我不明白，怎么可能是9.7，但是没有listagg功能？ ！ ：confused：

I admit I don't understand, how can it be 9.7, but there is not listagg function?! :confused:

我也执行了：

SELECT * FROM SYSCAT.FUNCTIONS

我收到了这个功能列表，但是没有像xmltext或xmlgroup这样的功能在替代解决方案中提到的答案:(。$ b $客户使用的是什么neanderthal数据库？还是我缺少某些东西？

I got back this function list, but there are no functions like xmltext or xmlgroup mentioned in alternative solutions down in the answers:(. What neanderthal database is the customer using? Or am I missing something?

感谢您的回复。

推荐答案

如果您的DB2版本支持pureXML（至少DB2 for LUW 9.1，我相信DB2 9 for z / OS），除了上面提到的@ PM77-1之外可以使用XMLAGG函数：

If your version of DB2 supports pureXML (that would be at least DB2 for LUW 9.1 and I believe DB2 9 for z/OS), in addition to what @PM77-1 suggested above, you could use the XMLAGG function:

select xmlserialize(
  xmlagg(
    xmlconcat(
      xmltext(column_name),
      xmltext(':'),
      xmltext(content),
      xmltext(',')
    )
  ) as varchar(10000)
) 
from 
  yourtable 
...

这篇关于db2中的Listagg替代的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！