16.20 - nPath Range-Matching Example: Find Data for Sessions That Checked Out at Least 3 Products - 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.

Modify the previous query call in nPath Range-Matching Example: Find Data for Sessions That Checked Out 3-6 Products to find sessions where the user checked out at least three products by changing the Pattern syntax element to:
Pattern ('H+.D*.C{3,}.D')

SQL-MapReduce Call

SELECT * FROM nPath (
  ON aggregate_clicks PARTITION BY sessionid ORDER BY clicktime
  USING
  Mode (NONOVERLAPPING)
  Pattern ('H+.D*.C{3,}.D')
  Symbols (
    pagetype = 'home' AS H,
    pagetype='checkout' AS C,
    pagetype<>'home' AND pagetype<>'checkout' AS D
  )
  Result (
    FIRST(sessionid OF C) AS sessionid,
    max_choose(productprice, productname OF C) AS
    most_expensive_product,
    MAX (productprice OF C) AS max_price,
    min_choose (productprice, productname OF C) AS
    least_expensive_product,
    MIN (productprice OF C) AS min_price
  )
) AS dt ORDER BY dt.sessionid;

Output

sessionid most_expensive_product max_price least_expensive_product min_price
5 cellphones 600 bookcases 150