Мой SQL-запрос к оракулу преобразования запросов

У меня ниже структуры базы данных

CREATE TABLE CUSTOMERS (
 custid char(4) constraint cust_pk primary key,
 firstname varchar(20),
 lastname varchar(25),
 city varchar(20),
 country varchar(20),
 creditlimit number(8,2)
);

CREATE TABLE PRODUCTS (
 prodID char(4) constraint prod_pk primary key,
 pname varchar(20),
 description varchar(50),
 category varchar(7), -- product category
 listprice numeric(5,2), -- list price
 weight numeric(4,1) -- weight 
);

CREATE TABLE SALES (
 saleno char(5) constraint sales_pk PRIMARY KEY,
 sdate date,
 paymentmethod varchar(20),
 custid char(4),
 constraint sales_fk_cust FOREIGN KEY (custid) references CUSTOMERS
);


CREATE TABLE SALESLINES (
 saleno char(5),
 prodid char(4),
 qty numeric(5),
 unitprice numeric(5,2),
 constraint sales_lines_pk PRIMARY KEY (saleno, prodid),
 constraint saleslines_fk_sale FOREIGN KEY (saleno) references SALES,
 constraint saleslines_fk_prod FOREIGN KEY (prodid) references PRODUCTS
);



INSERT INTO CUSTOMERS VALUES('C002', 'Ruby', 'Ringer','Springfield', 'Canada',125000);
INSERT INTO CUSTOMERS VALUES('C003', 'Bob', 'Bennett','Tucson','USA',50000);
INSERT INTO CUSTOMERS VALUES('C004', 'Pat', 'Rowling','Ottowa','Canada', 129000);
INSERT INTO CUSTOMERS VALUES('C905', 'Sue', 'Smith','Riverside','USA', 125000);
INSERT INTO CUSTOMERS VALUES('C005', 'Jim', 'Jason','New York', 'USA',25000);
INSERT INTO CUSTOMERS VALUES('C101', 'Darcy', 'Doe','Tucson','USA', 14500);
INSERT INTO CUSTOMERS VALUES('C104', 'Dan', 'Doe','Hermosillo','Mexico',10100);
INSERT INTO CUSTOMERS VALUES('C505', 'Sue', 'Smith','Tucson','USA', 19500);
INSERT INTO CUSTOMERS VALUES('C125', 'Bill', 'Jackson','Vancouver','Canada', 75000);




INSERT INTO PRODUCTS VALUES ('P051', '19" Monitor', 'Widescreen, black', 'Display', 114.95, 17.5);
INSERT INTO PRODUCTS VALUES ('P055', '27" Monitor', 'Widescreen, LCD ultra-sharp', 'Display', null, 50);
INSERT INTO PRODUCTS VALUES ('P012', 'Keyboard', 'Black, full size keys', 'Input', 14.75, 2);
INSERT INTO PRODUCTS VALUES ('P011', 'Keyboard', 'Ergonomic, soft touch keys', 'Input', 45.25, 2.5);
INSERT INTO PRODUCTS VALUES ('P074', 'Optical Mouse', '2-button mouse, basic', 'Input', 9.99, 1);
INSERT INTO PRODUCTS VALUES ('P075', 'Optical Mouse', 'Compact notebook optical mouse', 'Input', 24.99, 0.5);
INSERT INTO PRODUCTS VALUES ('P208', 'Microphone', 'USB microphone, desktop', 'Audio', 22.95, 2.5);
INSERT INTO PRODUCTS VALUES ('P210', 'Speakers', '2-speaker, stereo, 10W', 'Audio', 39.99, 7.5);
INSERT INTO PRODUCTS VALUES ('P010', 'Classic Keyboard', 'Black, spill resistant design', 'Input', 21.50, null);
INSERT INTO PRODUCTS VALUES ('P302', 'Inkjet Printer', 'Color and B/W modes, wireless support', 'Print', 89.99, null);
INSERT INTO PRODUCTS VALUES ('P304', 'Laser Printer', 'Color heavy-duty printer', 'Print', 119.50, 25);
INSERT INTO PRODUCTS VALUES ('P312', 'Letter Paper', 'Multipurpose 20lb, 500 sheets', 'Print', 7.50, 5);
INSERT INTO PRODUCTS VALUES ('P046', 'Screen cover', 'Dust protection unit', 'Display', 12.50, null);
INSERT INTO PRODUCTS VALUES ('P215', 'Speakers', 'Mono output, 5W', 'Audio', null, 5.5);
INSERT INTO PRODUCTS VALUES ('P235', 'Audio Pak', 'Speakers and Microphone', 'Audio', 35.95, 10);
INSERT INTO PRODUCTS VALUES ('P322', 'Printer Ink', 'Replacement Cartridges', 'Print', 30, 4);


INSERT INTO SALES VALUES('AX014','01-Mar-2017','Check',  'C002');
INSERT INTO SALES VALUES('CQ951','03-Oct-2016','Cash',   'C005');
INSERT INTO SALES VALUES('BC001','18-Feb-2017','Credit', 'C003');
INSERT INTO SALES VALUES('CB714','21-Sep-2014','PayPal', 'C101');
INSERT INTO SALES VALUES('BM701','04-Mar-2017','GWallet','C002');
INSERT INTO SALES VALUES('LC294','04-Apr-2015','Credit', 'C005');
INSERT INTO SALES VALUES('MB720','04-Oct-2015','PayPal', 'C104');

INSERT INTO SALESLINES VALUES ('AX014','P010',3,19.35);
INSERT INTO SALESLINES VALUES ('AX014','P012',2,14.75);
INSERT INTO SALESLINES VALUES ('AX014','P312',2,7.5);
INSERT INTO SALESLINES VALUES ('AX014','P011',10,40);
INSERT INTO SALESLINES VALUES ('CQ951','P011',4,54.3);
INSERT INTO SALESLINES VALUES ('CQ951','P046',50,11.25);
INSERT INTO SALESLINES VALUES ('BC001','P011',4,40.73);
INSERT INTO SALESLINES VALUES ('BC001','P074',4,8.99);
INSERT INTO SALESLINES VALUES ('BC001','P046',3,12.5);
INSERT INTO SALESLINES VALUES ('BC001','P322',5,30);
INSERT INTO SALESLINES VALUES ('CB714','P011',5,45.25);
INSERT INTO SALESLINES VALUES ('CB714','P302',3,89.99);
INSERT INTO SALESLINES VALUES ('MB720','P011',5,45);
INSERT INTO SALESLINES VALUES ('MB720','P302',3,90);
INSERT INTO SALESLINES VALUES ('BM701','P208',3,32.13);
INSERT INTO SALESLINES VALUES ('LC294','P051',1,103.46);
INSERT INTO SALESLINES VALUES ('LC294','P302',3,89.99);
INSERT INTO SALESLINES VALUES ('LC294','P235',5,43.14);
INSERT INTO SALESLINES VALUES ('LC294','P322',2,33);
INSERT INTO SALESLINES VALUES ('LC294','P312',4,6.75);
INSERT INTO SALESLINES VALUES ('LC294','P010',3,23.65);
INSERT INTO SALESLINES VALUES ('LC294','P074',4,13.99);



commit;

Для продуктов с не менее чем двумя заказами (в целом, независимо от способов оплаты) отображать идентификатор продукта, название продукта, количество заказов на продажу, оплаченное наличными (заголовок: Num Cash Sales), количество заказов на продажу в целом (заголовок: Num Общие продажи)

Я написал ниже запрос

select sl.prodid, p.pName, a.NumCashSales,count(sl.prodid) as NumOverallSales 
from 
(select count(saleno) as  NumCashSales, saleno as salesno 
    from sales where paymentmethod = 'Cash'
) a 
    Right Outer join saleslines sl 
    Join PRODUCTS p
on sl.prodid = p.prodid 
on sl.saleno= a.salesno

group by sl.prodid 
having count(sl.prodid) >=2; 

он работает на mysql, но на oracle он дает ошибку, как

ORA-00979: не выражение GROUP BY 00979. 00000 - "не выражение GROUP BY" * Причина: * Действие: Ошибка в строке: 1 Колонка: 19

Кто-нибудь может помочь.