nPath Function Results Example | Teradata Vantage - nPath Results Example: FIRST, Three Forms of ACCUMULATE, COUNT, and NTH - Teradata® Database

Input

The input table for this example is clicks, as in nPath Results Example: FIRST and Three Forms of ACCUMULATE.

SQL Call

SELECT * FROM nPath (
  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
  )
) ORDER BY sessionid;