Mapping Google Merchandise Store GA4 page titles to categories such as PLP, PDP and rest

bq_standard_page_title_mapping.sql

WITH base_table AS (
  SELECT
    event_name,
    event_date,
    event_timestamp,
    user_pseudo_id,
    user_id,
    device,
    geo,
    traffic_source,
    event_params,
    user_properties
  FROM
    `bigquery-public-data.ga4_obfuscated_sample_ecommerce.events_*`
  WHERE
    _table_suffix >= '20210101'
  AND event_name IN ('page_view')
)
, unnested_events AS (
  SELECT
    event_date AS date,
    event_timestamp AS event_timestamp_microseconds,
    user_pseudo_id,
    MAX(CASE WHEN c.key = 'ga_session_id' THEN c.value.int_value END) AS visitID,
    MAX(CASE WHEN c.key = 'ga_session_number' THEN c.value.int_value END) AS visitNumber,
    MAX(CASE WHEN c.key = 'page_title' THEN c.value.string_value END) AS page_title,
    MAX(CASE WHEN c.key = 'page_location' THEN c.value.string_value END) AS page_location
  FROM 
    base_table,
    UNNEST (event_params) c
  GROUP BY 1,2,3
)

SELECT
*,
CASE WHEN ARRAY_LENGTH(SPLIT(page_location, '/')) >= 5 
          AND
          CONTAINS_SUBSTR(ARRAY_REVERSE(SPLIT(page_location, '/'))[SAFE_OFFSET(0)], '+')
          AND (LOWER(SPLIT(page_location, '/')[SAFE_OFFSET(4)]) IN 
                                      ('accessories','apparel','brands','campus+collection','drinkware',
                                        'electronics','google+redesign',
                                        'lifestyle','nest','new+2015+logo','notebooks+journals',
                                        'office','shop+by+brand','small+goods','stationery','wearables'
                                        )
                OR
                LOWER(SPLIT(page_location, '/')[SAFE_OFFSET(3)]) IN 
                                      ('accessories','apparel','brands','campus+collection','drinkware',
                                        'electronics','google+redesign',
                                        'lifestyle','nest','new+2015+logo','notebooks+journals',
                                        'office','shop+by+brand','small+goods','stationery','wearables'
                                        )
          )
          THEN 'PDP'
          WHEN NOT(CONTAINS_SUBSTR(ARRAY_REVERSE(SPLIT(page_location, '/'))[SAFE_OFFSET(0)], '+'))
          AND (LOWER(SPLIT(page_location, '/')[SAFE_OFFSET(4)]) IN 
                                      ('accessories','apparel','brands','campus+collection','drinkware',
                                        'electronics','google+redesign',
                                        'lifestyle','nest','new+2015+logo','notebooks+journals',
                                        'office','shop+by+brand','small+goods','stationery','wearables'
                                        )
                OR 
                LOWER(SPLIT(page_location, '/')[SAFE_OFFSET(3)]) IN 
                                        ('accessories','apparel','brands','campus+collection','drinkware',
                                          'electronics','google+redesign',
                                          'lifestyle','nest','new+2015+logo','notebooks+journals',
                                          'office','shop+by+brand','small+goods','stationery','wearables'
                                          )
          )
          THEN 'PLP'
      ELSE page_title
      END AS page_title_adjusted 

FROM 
  unnested_events