nPath Range-Matching Example | Teradata Vantage - 17.05 - nPath Range-Matching Example: Find First Product with Multiple Referrers in Any Session - Teradata Database

Teradata Vantage™ - Advanced SQL Engine Analytic Functions

prodname
Advanced SQL Engine
Teradata Database
vrm_release
17.00
17.05
created_date
June 2020
category
Programming Reference
featnum
B035-1206-170K

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