The join functionality in a CAS View has been extended. You can now join tables on multiple keys since the SAS Viya 2020.1.3 stable cadence. Therefore, the changes are included in the 2021.1 long term support.
If you are not familiar with the star schemas in CAS, I recommend reviewing the following posts:
Select any image to see a larger version.
Mobile users: To view the images, select the "Full" version at the bottom of the page.
You can now specify multiple join keys. For example, the customer code and the record source:
{keys={'m_customer_code = c_customer_code', 'm_record_source = c_record_source'}
To create a CAS View (the star schema in the second diagram), you could write:
cas mySession sessopts=(caslib="casuser" timeout=1800 locale="en_US"
metrics="true" dqLocale="(ENUSA)");
caslib _all_ assign;
* Multi-key join FACT + DIM 2 keys + DIM one key;
proc casutil;
droptable casdata="mail_view_multi" incaslib="casuser" quiet;
quit;
proc cas;
table.view / promote=true name='mail_view_multi'
tables={
{name='mailorder_mkey', varlist={'qty'}, as='m'},
{keys={'m_customer_code = c_customer_code', 'm_record_source = c_record_source'},
name='customers_mkey',
varList={'addr1','addr2','city',
'region','state','zip'}, as='c'},
{keys={'m_pcode = p_pcode'},
name='products_rep', varlist={'price', 'cost', 'descrip', 'type'},
computedVars={{name="price_cost_ratio"}},
computedVarsProgram="price_cost_ratio = price/cost;", as='p'},
{keys={'m_catcode = cat_catcode'},
name='catcode_rep', varlist={'catalog'}, as='cat'}
};
quit;
cas mySession terminate;
Note how the price cost ratio is defined as a calculation within the view.
Facts and dimensions tables loaded in CAS.
Special thanks to Gordon Keener in SAS R&D for his time, efforts, and sharing information on this topic.
I would recommend the following resources:
Thank you for your time reading this post. Please share your experience with the CAS Star Schemas and help others.
If you wish to get more information, please leave a comment.
Find more articles from SAS Global Enablement and Learning here.
Available on demand!
Missed SAS Innovate Las Vegas? Watch all the action for free! View the keynotes, general sessions and 22 breakouts on demand.
Data Literacy is for all, even absolute beginners. Jump on board with this free e-learning and boost your career prospects.