BigQuery filter per the last Date and use Partition

Question

I asked how to filter the last date and got excellent answers (BigQuery, how to use alias in where clause?), they all work, but, they scan the whole table, the field SETTLEMENT

Answer 1

Now that scripting is in beta in BigQuery, you can declare a variable that contains the target date. Here's an example:

SET max_date DATE DEFAULT (SELECT DATE(MAX(datehour)) FROM `fh-bigquery.wikipedia_v3.pageviews_2019` WHERE wiki='es');

SELECT MAX(views)
FROM `fh-bigquery.wikipedia_v3.pageviews_2019` 
WHERE DATE(datehour) = max_date
AND wiki='es'