nPath Range-Matching Example | Teradata Vantage - 17.05 - nPath Range-Matching Example: Find Sessions That Start at Home Page and Visit Page1 - 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 ('^H.A*.P1.A*')
  Symbols (pagetype='home' AS H, pagetype='page1' AS P1, TRUE AS A)
  Result (
    FIRST (sessionid OF A) AS sessionid,
    ACCUMULATE (pagetype OF ANY(H,P1,A)) AS path
  )
) AS dt ORDER BY dt.sessionid;

Output

sessionid path
1 [home, home1, page1, home, home1, page1, home, home, home, home1, page1, checkout, home, home, home, home, home, home, home, home, home]
2 [home, home, home, home, home, home, home, home, home, home1, page1, checkout, checkout, home, home]
3 [home, home, home, home, home, home, home, home, home1, page1, home, home1, page1, home]
4 [home, home, home, home, home, home, home1, home1, home1, page1, page1, page1]
5 [home, home, home, home, home1, home1, home1, page1, page1, page1, page2, page2, page2, checkout, checkout, checkout, page2, page2, page2]