By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
create table Products (
ProdId number generated always as identity primary key
, ProdName varchar2(20) not null
);
create table Stores (
StoreId number generated always as identity primary key
, StoreName varchar2(20) not null
);
create table Customers (
CustomerId number generated always as identity primary key
, CustomerName varchar2(20) not null
);
create table Prices (
PriceId number generated always as identity primary key
, ProdId number not null
, Price number
, ValidFrom date default on null sysdate
, constraint fk_Prices_Product foreign key (ProdId) references Products (ProdId)
);
create unique index uniq_prices_product_price on Prices (ProdId, ValidFrom);
create table Orders (
OrderId number generated always as identity primary key
, CustomerId number not null
, StoreId number not null
, OrderedAt date default on null sysdate
, constraint fk_Orders_Customer foreign key (CustomerId) references Customers (CustomerId)
, constraint fk_Orders_Store foreign key (StoreId) references Stores (StoreId)
);
create table OrderLines (
OrderLineId number generated always as identity primary key
, OrderId number not null
, ProdId number not null
, ProdQuantity number not null
, constraint fk_OrderLines_Order foreign key (OrderId) references Orders (OrderId)
, constraint fk_OrderLines_Prod foreign key (ProdId) references Products (ProdId)
);
create table Payments (
PaymentId number generated always as identity primary key
, OrderId number not null
, PaidAt date default on null sysdate
, PaidAmount number not null
, constraint fk_Payments_Order foreign key (OrderId) references Orders (OrderId)
);
create view Prices_V as
select
p.*
, coalesce(
lead(p.ValidFrom) over (partition by p.ProdId order by p.ValidFrom)
, to_date('9999', 'YYYY')
) ValidTo
from Prices p;
create view Orders_V as
select
o.*
, (
select sum(ol.ProdQuantity * p.Price)
from OrderLines ol
join Prices_V p on (p.ProdId = ol.ProdId and o.OrderedAt between p.ValidFrom and p.ValidTo)
where o.OrderId = ol.OrderId
) Total
, (
select sum(PaidAmount)
from Payments p
where p.OrderId = o.OrderId
) TotalPaid
from Orders o
insert into Products(ProdName)
select 'Prod A' from dual union all
select 'Prod B' from dual;
2 rows affected
insert into Stores(StoreName) values ('Store A');
1 rows affected
insert into Customers(CustomerName)
select 'Customer A' from dual union all
select 'Customer B' from dual;
2 rows affected
insert into Prices(ProdId, Price, ValidFrom)
select 1, 10, sysdate - 10 from dual union all
select 1, 12, sysdate - 2 from dual union all
select 1, 14, sysdate + 3 from dual union all
select 2, 100, sysdate - 10 from dual union all
select 2, 90, sysdate - 2 from dual union all
select 2, null, sysdate + 5 from dual;
6 rows affected
insert into Orders(CustomerId, StoreId, OrderedAt)
select 1 cid, 1 stoid, sysdate - 5 from dual union all
select 2, 1, sysdate - 5 from dual union all
select 2, 1, sysdate - 1 from dual;
3 rows affected
insert into OrderLines(OrderId, ProdId, ProdQuantity)
select 1 ordid, 1 prodid, 3 prodquant from dual union all
select 1, 2, 2 from dual union all
select 2, 2, 10 from dual union all
select 3, 2, 10 from dual;
4 rows affected
insert into Payments(OrderId, PaidAmount) values (2, 500);
1 rows affected
select * from Prices_V order by ProdId, ValidFrom;
| PRICEID | PRODID | PRICE | VALIDFROM | VALIDTO |
|---|---|---|---|---|
| 1 | 1 | 10 | 16-JAN-21 | 24-JAN-21 |
| 2 | 1 | 12 | 24-JAN-21 | 29-JAN-21 |
| 3 | 1 | 14 | 29-JAN-21 | 01-JAN-99 |
| 4 | 2 | 100 | 16-JAN-21 | 24-JAN-21 |
| 5 | 2 | 90 | 24-JAN-21 | 31-JAN-21 |
| 6 | 2 | null | 31-JAN-21 | 01-JAN-99 |
select * from OrderLines order by OrderId, ProdId;
| ORDERLINEID | ORDERID | PRODID | PRODQUANTITY |
|---|---|---|---|
| 1 | 1 | 1 | 3 |
| 2 | 1 | 2 | 2 |
| 3 | 2 | 2 | 10 |
| 4 | 3 | 2 | 10 |
select * from Orders_v order by OrderId;
| ORDERID | CUSTOMERID | STOREID | ORDEREDAT | TOTAL | TOTALPAID |
|---|---|---|---|---|---|
| 1 | 1 | 1 | 21-JAN-21 | 230 | null |
| 2 | 2 | 1 | 21-JAN-21 | 1000 | 500 |
| 3 | 2 | 1 | 25-JAN-21 | 900 | null |