Error : not a GROUP BY expression

Question

Hi everyone,
Looks like i need some help here.. :) dont know what it means but im getting this message
00979. 00000 - "not a GROUP BY expression"
*Cause:   
*Action:
Error at Line: 137 Column: 36
this is the function:
function get_path(materialID in number, materialTypeID in number, inTopFolderID in number default null, inMaterialFolderID in number default null, webMode in number default 1)
return varchar2;
and im using it on my query
,(select material_util.get_path(m.material_id, 8, 1021695, min(mf.IP_MATERIALFOLDERID), 1)
from material m, materialfolder mf
where mf.nfx_link = m.MATERIAL_ID
and m.template_id = t.template_id) as Path
looks like min(mf.IP_MATERIALFOLDERID) is having some issues here.. dont know why..
let me know guys..
thanks..
J

Answer 1

A example
with testdata as
select 1 idu, 1 value1, 7 value2, 40 value3 from dual union all
select 2 idu, 2 value1, 8 value2, 45 value3 from dual union all
select 3 idu, 3 value1, 9 value2, 50 value3 from dual union all
select 1 idu, 4 value1, 4 value2, 55 value3 from dual union all
select 2 idu, 5 value1, 5 value2, 60 value3 from dual union all
select 3 idu, 6 value1, 2 value2, 65 value3 from dual
select min(value1), avg(value2), max(value1), sum(value3) from testdata;
MIN(VALUE1) AVG(VALUE2) MAX(VALUE1) SUM(VALUE3)
1 5,83333333333333333333333333333333333333 6 315
Calculate the aggregated functions with all the data of the table.
select idu, min(value1), avg(value2), max(value1), sum(value3) from testdata;
Error SQL: ORA-00937:
00937. 00000 - "not a single-group group function"
Oracle don't know about what values have to calculate the aggrgates functions because there are not aggregated values in the select.
select idu, min(value1), avg(value2), max(value1), sum(value3) from data group by idu;
IDU MIN(VALUE1) AVG(VALUE2) MAX(VALUE1) SUM(VALUE3)
1 1 5,5 4 95
2 2 6,5 5 105
3 3 5,5 6 115
Calculate the aggregated functions in order at idu value.