How to use the generated SQL of "Recommendation"

Question

Dear Experts,
I am using KXEN recommendation function. After trained the model, I expose the result in form of HANA SQL. However, I am really have no idea how to make this SQL runnable because there are some subqueries like:
FROM $Dataset "SPACEIN"
  LEFT OUTER JOIN (SELECT * FROM  WHERE "GRAPH_NAME" = 'Transactions') "PRODUCTS" ON ("PRODUCTS"."KXNODEFIRST" = "SPACEIN".MemberID)
  LEFT OUTER JOIN (SELECT * FROM  WHERE "GRAPH_NAME" = 'Product') "RULES" ON ("PRODUCTS"."KXNODESECOND" = "RULES"."KXNODESECOND")
  LEFT OUTER JOIN (SELECT * FROM  WHERE "GRAPH_NAME" = 'Transactions') "NOTIN" ON ("RULES"."KXNODESECOND_2" = "NOTIN"."KXNODESECOND") AND ("NOTIN"."KXNODEFIRST" = "SPACEIN".MemberID)
Please pay attention to the red parts. While $Dataset, I assume it should be the data source which is used to train the model, but how to handle the "GRAPH" parts(the next 3 subqueries)? There are something missing after "FROM" clause, what should I fill in here? why the XKEN will generate sucn incomplete codes?
Thanks for your help!

Answer 1

Hi Richard,
To apply a recommendation model, you first need to save your model in your database. (saving the model in the database for such models and for what you want to do is mandatory).
Once you saved it, you will see many tables starting with "Kx" : KxInfos, KxLinks, KxNodes...
These tables contains information on the nodes available in the data used, on the links between products.
Now, if you generate the SQL code for Hana, the name of your KxLinks table should now be used in the SQL code.
When prompted for $Dataset and $Key, you should specify in place of $Dataset the name of the table on which you want to apply your model. In place of $Key, you should enter the name of the key of this table (e.g. UserId).
In my case $Dataset =>KAR_UniqueCustomers and $Key=>UserID
My generated code looks like this :
FROM KAR_UniqueCustomers "SPACEIN"
LEFT OUTER JOIN (SELECT * FROM KxLinks1 WHERE "GRAPH_NAME" = 'Transactions') "PRODUCTS" ON ("PRODUCTS"."KXNODEFIRST" = "SPACEIN".UserID)
LEFT OUTER JOIN (SELECT * FROM KxLinks1 WHERE "GRAPH_NAME" = 'ItemPurchased') "RULES" ON ("PRODUCTS"."KXNODESECOND" = "RULES"."KXNODESECOND")
Note that your application table must contain:
- A column with the same name as your users identifier in the training dataset. It contains the list of distinct users (stricly 1 row for each customer id)
- A column with the same name as your products name in the training dataset. It can contain the name of the same product for all customers.
I hope you'll make it work !
Armelle