BigQuery :rechercher plusieurs tables et agréger avec first_seen et last_seen

Je voudrais d'abord unir les tables (dans BigQuery, la syntaxe de l'union est une virgule). Ensuite, il y a deux approches :

1. Utilisez les fonctions analytiques FIRST_VALUE et LAST_VALUE.

SELECT id, timestamp_first, timestamp_last, data FROM
(SELECT 
  id,
  timestamp,
  FIRST_VALUE(timestamp) OVER(
    PARTITION BY id
    ORDER BY timestamp ASC
    ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
  AS timestamp_first,
  LAST_VALUE(timestamp) OVER(
    PARTITION BY id
    ORDER BY timestamp ASC
    ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
  AS timestamp_last
FROM table1, table2, table3

2. Utilisez l'agrégation MIN/MAX sur l'horodatage pour rechercher le premier/le dernier, puis rejoignez les mêmes tables.

SELECT a.id id, timestamp_first, timestamp_last, data FROM
(SELECT id, data FROM table1,table2,table3) a
INNER JOIN
(SELECT 
   id, 
   MIN(timestamp) timestamp_first,
   MAX(timestamp) timestamp_last 
 FROM table1,table2,table3 GROUP BY id) b
ON a.id = b.id