nPath範囲一致例: 3～6個の製品をチェックしたセッションのデータの検索 - Advanced SQL Engine - Teradata Database

入力

入力テーブルは、LAG式とLEAD式の例: 入力問合わせの別名なしによるaggregate_clicksです。

SQL-MapReduce呼び出し

SELECT * FROM nPath (
  ON aggregate_clicks PARTITION BY sessionid ORDER BY clicktime
  USING
  Mode (NONOVERLAPPING)
  Pattern ('H+.D*.C{3,6}.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;

出力