Best Practice - existence of details

Question

There are many ways to manage the question of existence of details. All will work. What I am interested in is Best Practice.
Example. There is a Customer table in the source, and there are Sales tables (order and detail). However, some people are recorded as Customers but there are no Sales associated with them. I am only interested in passing forward into the mapping a) customers signed-up in a recent date range and b) customers with an associated sales record i.e. an order. Obviously Sales are in a zero-to-one-or-many relationship with Customer.
In this scenario, I do not want any Sales data. I merely want to select Customers if Sales exist, and the Customers fit a category in Customer.
So, I am asking what the OWB experts here consider Best Practice to perform an IF EXISTS test on a related record. What would the mapping look like?
Regards,
Donna

Answer 1

Your solution should work, but test it against
expected results, as I am not familiar in detail with
your requirements. I did, and I get sub-second times. It is really fast.
>
a) To create a bitmap index (non unique) in Oracle it
is sufficient to issue a "create index INDEX_NAME on
TABLE_NAME (COLUMN_NAME). You can achieve this with
OWB by specifying NO_INDEX as index type in the
configuration properties of the table (where you
define indices).Umm. I do not want a bitmap index. I want a b-tree. Is that what you meant?
>
b) To create a index-organized table, you have to add
the "ORGANIZATION INDEX" clause to the create table
command.Splendid. Thank you.
Best regards,
Donna