Having trouble summing columns in SQL Server joined view - oracle-apex

Question

Moi guys, Matt here. I'm having trouble with a relatively complicated view. I have a parts and service table that each have unique identifiers for a given part/service. I'm trying to link these to a service invoice table and subsequent view as a M:N relationship, so I've set up intermediary relational tables, with both the invoice number (invoice primary key) and part/service number (part/service primary key) as the combined primary key. Here's my code for the whole relationship and view:
CREATE TABLE service_invoice
( servinv_Num VARCHAR2(10) CONSTRAINT serv_snum_PK PRIMARY KEY,
servinv_EmpID NUMBER(6) CONSTRAINT serv_empnum_FK REFERENCES employee(empID),
servinv_CustID NUMBER(6) CONSTRAINT serv_custid_FK REFERENCES customer(custID),
servinv_VIN VARCHAR2(25) CONSTRAINT serv_VIN_FK REFERENCES vehicle(vehicle_vin),
servinv_Terms VARCHAR2(6) CONSTRAINT serv_trms_NN NOT NULL,
servinv_Date DATE );
CREATE TABLE Parts
( PartID VARCHAR2(10) CONSTRAINT Part_PartID_PK PRIMARY KEY,
PartDesc VARCHAR2(50) CONSTRAINT Part_PartDesc_NN NOT NULL,
PartCharge NUMBER(4,2) CONSTRAINT Part_PartCharge_NN NOT NULL );
CREATE TABLE Service
( ServiceID VARCHAR2(10) CONSTRAINT Serv_ServID_PK PRIMARY KEY,
ServDesc VARCHAR2(50) CONSTRAINT Serv_ServName_NN NOT NULL,
ServCharge NUMBER(4,2) CONSTRAINT Serv_ServCharge_NN NOT NULL );
CREATE TABLE Serv_SI_Rel
( SI_num VARCHAR2(10) CONSTRAINT ServSI_SInum_FK REFERENCES service_invoice(servinv_Num),
ServiceID VARCHAR2(10) CONSTRAINT ServSI_ServID_FK REFERENCES Service(ServiceID),
CONSTRAINT ServSI_SInum_ServID_PK PRIMARY KEY(SI_num, ServiceID) );
CREATE TABLE Parts_SI_Rel
( SI_num VARCHAR2(10) CONSTRAINT PartSI_SInum_FK REFERENCES service_invoice(servinv_Num),
PartID VARCHAR2(10) CONSTRAINT PartSI_PartID_FK REFERENCES Parts(PartID),
CONSTRAINT PartSI_SInum_PartID_PK PRIMARY KEY(SI_num, PartID) );
CREATE OR REPLACE VIEW ServiceInvoiceDoc
AS
(
SELECT si.servinv_Num, si.servinv_Date, si.servinv_Terms,
es.empName,
sc.custName, sc.custHouse, sc.custCity,
sc.custState, sc.custZIP, sc.custPhone, sc.custEmail,
sv.vehicle_VIN, sv.vehicle_mileage,
srel.ServiceID,
prel.PartID,
s.ServDesc, s.ServCharge,
p.PartDesc, p.PartCharge,
SUM(s.ServCharge) TotalServCharges,
SUM(p.PartCharge) TotalPartsCharges,
( SUM(s.ServCharge)+SUM(p.PartCharge) ) SubTotalCharges,
( SUM(s.ServCharge)+SUM(p.PartCharge) )*0.0825 Taxes,
( SUM(s.ServCharge)+SUM(p.PartCharge) )*1.0825 TotalCharges
FROM service_invoice si
JOIN employee es
ON (es.empID = si.servinv_EmpID)
JOIN customer sc
ON (sc.custID = si.servinv_CustID)
JOIN vehicle sv
ON (sv.vehicle_VIN = si.servinv_VIN)
LEFT OUTER JOIN Serv_SI_Rel srel
ON (srel.SI_Num = si.servinv_Num)
LEFT OUTER JOIN Parts_SI_Rel prel
ON (prel.SI_num = si.servinv_Num)
JOIN Parts p
ON (prel.PartID = p.PartID)
JOIN Service s
ON (srel.ServiceID = s.ServiceID) );
The error I get has to do with summing the individual parts and service charges in the M:N relationship. Here's the error code from the run:
ORA-00937: not a single-group group function
I've tried fixing with a group by command, but the grouping identifier (service invoice) isn't included on the part or service tables, and the joins don't seem to link these up for a group. e.g. I tried calling GROUP BY si.servinv_Num
Can this be resolved at all or is it completely wrong? I have the option of dropping the M:N relationship as a 1:M and simply making a separate invoice for each part/service charge, but I would prefer to keep it compact and professional.
Any help would be greatly appreciated. Thank you so much for your time!

Answer 1

a) wrong tag
b) I'd imagine you would need to list all columns in group by clause that aren't aggregated, as per Oracle
...
group by si.servinv_Num, si.servinv_Date, si.servinv_Terms,
es.empName,
sc.custName, sc.custHouse, sc.custCity,
sc.custState, sc.custZIP, sc.custPhone, sc.custEmail,
sv.vehicle_VIN, sv.vehicle_mileage,
srel.ServiceID,
prel.PartID,
s.ServDesc, s.ServCharge,
p.PartDesc, p.PartCharge