16.20 - nPath Range-Matching Example: Find First Product with Multiple Referrers in Any Session - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ - NewSQL Engine Analytic Functions

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Release Date
July 2019
Content Type
Programming Reference
Publication ID
B035-1206-162K
Language
English (United States)

Input

The input table is aggregate_clicks, from LAG and LEAD Expressions Example: No Alias for Input Query.

SQL-MapReduce Call

SELECT * FROM nPath (
  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 ORDER BY dt.sessionid;

Output

sessionid product
1 envelopes
2 tables
3 bookcases
4 tables
5 Appliances