[英]SQL Listagg function - error
I am having trouble with my LISTAGG
function. 我的
LISTAGG
功能有问题。 I keep getting the error ORA-00937: not a single group function . 我一直收到错误ORA-00937:不是单个组功能 。 I have googled this error but it's still not quite clear on what's wrong.
我已经搜索了这个错误,但仍然不清楚错误是什么。
Scenario : I have a table of segments. 场景 :我有一个段表。 A segment can have multiple people assigned to them (one to many).
一个细分可以分配多个人(一对多)。 I need my ouput / report to show the segment number in one column and a list of the users in the other.
我需要我的输出/报告来显示一列中的段号和另一列中的用户列表。
Query : 查询 :
select fcs.nld_flood_control_segment_id
, fcs.fc_segment_name
, fcs.fc_segment_abbrev_name
, LISTAGG(ps.first_name|| ' ' ||ps.last_name, ', ') within group (ORDER BY fcs.nld_flood_control_segment_id, ps.last_name) "ListOfReps"
from nld_flood_control_segments fcs
, nld_fc_segment_person_xref xr
, persons ps
where fcs.nld_flood_control_segment_id = :P1_id
and :P1_id = xr.nld_flood_control_segment_id
and xr.person_id = ps.person_id
order by nld_flood_control_segment_id asc
;
Any help would be greatly appreciated. 任何帮助将不胜感激。 Thanks in advance.
提前致谢。
The LISTAGG function has the following syntax structure: LISTAGG函数具有以下语法结构:
LISTAGG( [,]) WITHIN GROUP (ORDER BY ) [OVER (PARTITION BY )]
LISTAGG is an aggregate function that can optionally be used as an analytic (ie the optional OVER() clause). LISTAGG是一个聚合函数,可以选择用作分析(即可选的OVER()子句)。 The following elements are mandatory:
以下要素是强制性的:
the column or expression to be aggregated;
the WITHIN GROUP keywords;
the ORDER BY clause within the grouping.
Example: 例:
LISTAGG(ename, ',') WITHIN GROUP (ORDER BY ename) AS employees
Try the following to see if it will provide what you need. 请尝试以下操作,看看它是否能满足您的需求。
LISTAGG(ps.first_name|| ' ' ||ps.last_name, ',') within group (ORDER BY ps.first_name|| ' ' ||ps.last_name) "ListOfReps"
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