Question

I want to make a query to list cats that took longer than average cats to sell?
I have five tables:

Animal, Sale, AnimalOrderItem, AnimalOrder, and SaleAnimal

Animal table: AnimalID, Name, Category
(cat, dog, fish)

SaleAnimal table: SaleID, AnimalID,
SalePrice

Sale table: SaleID, date, employeeID,
CustomerID

AnimalOrderItem table: OrderID,
AnimalID, cost

AnimalOrder: OrderID, OrderDate,
ReceivingDate,
SupplierID, ShippingCost, EmployeeID

There is other tables I don’t think they have an effect on the query.

I thought of the following … make a query to calculate days to sell for all ex.:

[SaleDate]-[ReceiveDate] AS DaysToSell
Have the INNER JOIN built:
Sale INNER JOIN ((AnimalOrder INNER JOIN (Animal INNER JOIN AnimalOrderItem
ON Animal.AnimalID = AnimalOrderItem.AnimalID) ON AnimalOrder.
OrderID = AnimalOrderItem.OrderID) INNER JOIN SaleAnimal ON Animal.
AnimalID = SaleAnimal.AnimalID) ON Sale.SaleID = SaleAnimal.SaleID

Create another query based on the above query

SELECT AnimalID, Name, Category, DaysToSell
WHERE Category="Cat" AND DaysToSell>
(SELECT Avg(DaysToSell)
FROM the earlier query
WHERE Category="Cat"
ORDER BY DaysToSell DESC;

After running the query it I got error saying

ORA-00921: unexpected end of SQL
command

Any suggestions! please

Answer 1

Queries can be combined with a subquery. For example,

select *
from (
    select * 
    from mytable
) subquery

Applying this pattern to your problem seems fairly straightforward.