¿Cómo resolver ORA-00937: no es una función de grupo de un solo grupo cuando se calcula el porcentaje?
Estoy tratando de obtener un porcentaje del itemid que está disponible en un área determinada. Usando mi consulta, me sale un errorORA-00937: not a single-group group function
Todos los detalles:
Tengo estas dos tablas:
ALLITEMS
---------------
ItemId | Areas
---------------
1 | EAST
2 | EAST
3 | SOUTH
4 | WEST
CURRENTITEMS
---------------
ItemId
---------------
1
2
3
y quiere este resultado:
---------------
Areas| Percentage
---------------
EAST | 50 --because ItemId 1 and 2 are in currentitems, so 2 items divided by the total 4 in allitems = .5
SOUTH | 25 --because there is 1 item in currentitems table that are in area SOUTH (so 1/4=.25)
WEST | 0 --because there are no items in currentitems that are in area WEST
El DDL:
drop table allitems;
drop table currentitems;
Create Table Allitems(ItemId Int,areas Varchar2(20));
Create Table Currentitems(ItemId Int);
Insert Into Allitems(Itemid,Areas) Values(1,'east');
Insert Into Allitems(ItemId,areas) Values(2,'east');
insert into allitems(ItemId,areas) values(3,'south');
insert into allitems(ItemId,areas) values(4,'east');
Insert Into Currentitems(ItemId) Values(1);
Insert Into Currentitems(ItemId) Values(2);
Insert Into Currentitems(ItemId) Values(3);
Mi consulta:
Select
areas,
(
Select
Count(Currentitems.ItemId)*100 / (Select Count(ItemId) From allitems inner_allitems Where inner_allitems.areas = outer_allitems.areas )
From
Allitems Inner_Allitems Left Join Currentitems On (Currentitems.Itemid = Inner_Allitems.Itemid)
Where inner_allitems.areas = outer_allitems.areas
***group by inner_allitems.areas***
***it worked by adding the above group by***
) "Percentage Result"
From
allitems outer_allitems
Group By
areas
El error:
Error at Command Line:81 Column:41 (which is the part `(Select Count(ItemId) From allitems inner_allitems Where inner_allitems.areas = outer_allitems.areas )`)
Error report:
SQL Error: ORA-00937: not a single-group group function
Cuando ejecuto exactamente la misma consulta en SQL Server, funciona bien. ¿Cómo arreglo esto en Oracle?