Help Writing a Query - (Newbie Warning)

Question

Hi All:
I am brand new to SQL, so please go easy on me. Here is what I am trying to do:
I have two tables: one is called bid_distributor and the other is called customer_profile.
Each customer in these tables has a unique customer ID. In the bid_distributor table, it is called distributor_customer_number. In the customer_profile table, it is called customer_code.
I want to create a query that returns a list of all customers in which customer_profile.flag = 'N' and where the number of bids that they own = 0.
Each bid is found within the bid_distributor table. Something like SELECT COUNT(bids) from bid_distributor b where b.distributor_customer_number would return the number of bids. This needs to equal 0.
Can anybody help me do this? Essentially, I need to first select all of the records where customer_profile.flag = 'N.' Then, out of those results, I need to select all records where the number of bids = 0.
Can this be done with one query? I've been struggling with this. Thanks!

Answer 1

Hi, if a customer has no bids, will there be any records for that ID in the
distributor table? When asking questions sample data is much preferred, kind
of like
WITH customer_profile AS
     (SELECT '1' customer_code, 'N' flag FROM DUAL UNION
      SELECT '2', 'Y' FROM DUAL UNION
      SELECT '3', 'Y' FROM DUAL UNION
      SELECT '4', 'N' FROM DUAL),
     bid_distributor AS
     (SELECT '2' distributor_customer_number, 1 bidnr, 100 bid FROM DUAL  UNION
      SELECT '2', 2, 150  FROM DUAL UNION
      SELECT '3', 1, 125 FROM DUAL)
SELECT customer_code
  FROM customer_profile
WHERE flag = 'N'
MINUS
SELECT distributor_customer_number
  FROM bid_distributorwhich selects 1 and 4.