nPath Example: First Product with Multiple Referrers - Teradata Vantage

This example finds the first product with multiple referrers in any session.

Input

• aggregate_clicks, as in LAG and LEAD Expressions Example: First and Most Expensive Purchases (under nPath Symbols)

SQL Call

SELECT * FROM NPath@coprocessor (
  ON aggregate_clicks PARTITION BY sessionid ORDER BY clicktime
  USING
    Mode(nonoverlapping)
    Pattern('REFERRER{2,}')
    Symbols(referrer IS NOT NULL AS REFERRER)
    Result (FIRST(sessionid OF REFERRER) AS sessionid,
            FIRST(productname OF REFERRER) AS product)
) AS dt;

Output

 sessionid product    
 --------- ---------- 
         5 appliances
         4 tables    
         2 tables    
         3 bookcases 
         1 envelopes

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