1.1 - 8.10 - nPath Results Example: FIRST, ACCUMULATE, COUNT, NTH - Teradata Vantage

Teradata Vantage™ - Machine Learning Engine Analytic Function Reference

Product
Teradata Vantage
Release Number
1.1
8.10
Release Date
October 2019
Content Type
Programming Reference
Publication ID
B700-4003-079K
Language
English (United States)

Input

The input table is clicks, as in nPath Results Example: FIRST, ACCUMULATE.

SQL Call

SELECT * FROM nPath@coprocessor (
  ON clicks PARTITION BY sessionid ORDER BY clicktime
  USING
  Mode ('nonoverlapping')
  Symbols (pagetype='home' AS H, pagetype='checkout' AS C,
           pagetype!='home' AND pagetype!='checkout' AS A)
  Pattern ('^H+.A*.C+$')
  Result (
    FIRST (sessionid OF ANY (H, A, C)) AS sessionid,
    FIRST (clicktime OF H) AS firsthome,
    FIRST (clicktime OF C) AS firstcheckout,
    ACCUMULATE (productname OF ANY (H,A,C))
      AS products_accumulate,
    COUNT (DISTINCT productname OF ANY(H,A,C))
      AS count_distinct_products,
    ACCUMULATE (CDISTINCT productname OF ANY (H,A,C))
      AS consecutive_distinct_products,
    ACCUMULATE (DISTINCT productname OF ANY (H,A,C))
      AS distinct_products,
    NTH (productname, -1 OF ANY(H,A,C)) AS nth
  )
) AS dt;

Output

sessionid firsthome firstcheckout products_accumulate count_distinct_products consecutive_distinct_products distinct_products nth
1 06:59:13 07:00:12 [null, null, television, television, envelopes, null] 3 [null, television, envelopes, null] [null, television, envelopes] null

Download a zip file of all examples and a SQL script file that creates their input tables from the attachment in the left sidebar.