Question

The following snippet is a join on multiple tables. I need to display all order number, customer name, product name, price and quantity ordered from anyone from Australia. I’m getting table headings but no rows. Is there something wrong with this?

SELECT 
      "order".orderno AS ord, 
      customer.cname, 
      product.prodname, 
      customer.country_code, 
      orderdetl.price, 
      orderdetl.qty, 
      country.country_code
    FROM 
      prema01.country, 
      prema01.customer, 
      prema01."order", 
      prema01.orderdetl, 
      prema01.product
    WHERE 
      customer.country_code = 'AUS'

I’ve changed the code, verified there is data in the tables and it still comes out blank.
I am completely stumped.

SELECT O.ORDERNO, C.CNAME, PN.PRODNAME, ODT.PRICE, ODT.QTY, ODT.QTY * PN.PRODSELL AS TOTAL
FROM prema01.ORDER O, prema01.CUSTOMER C, prema01.ORDERDETL ODT, prema01.PRODUCT PN, prema01.COUNTRY CT
WHERE CT.COUNTRY_NAME = 'Australia' 
AND C.COUNTRY_CODE = CT.COUNTRY_CODE 
AND C.CUSTNO = O.CUSTNO 
AND O.ORDERNO = ODT.ORDERNO 
AND PN.PRODNO = ODT.PRODNO AND O.ORDERNO <= 60
ORDER BY TOTAL DESC;

forgot to add the change. the tables have data in them, i’ve physically verified that.

Answer 1

For starters, you need some join conditions e.g.

Select
  r.country_code,
  c.cname
From
  prema01.country r
    inner join
  prema01.customer c
    on r.country_code = c.country_code

You need to build up the relationships with the other tables in a similar way.

Also, are you sure your tables have any data in them. Does

Select
  Count(*)
From
  prema01.country

return anything? How about

Select
  Count(*)
From
  prema01.customer
Where
  country_code = 'AUS'

?