first rev - Quarry

This query is marked as a draft This query has been published by KCVelaga (WMF).

SQL

WITH
	least_rev_dt AS (
      SELECT
          rev_timestamp AS dt,
      		'constant' AS constant
      FROM
          revision
      WHERE
      	rev_id = (SELECT MIN(rev_id) FROM revision)),

	least_ar_rev_dt AS (
      SELECT
      	ar_timestamp AS dt
            		'constant' AS constant
      FROM 
      	archive
      WHERE
      	ar_rev_id = (SELECT MIN(ar_rev_id) FROM archive))

SELECT
	CASE
    	WHEN rev.dt <= ar_rev.dt THEN rev.dt
        ELSE ar_rev.dt
     END AS dt
FROM
	least_rev_dt rev
    JOIN least_ar_rev_dt ar_rev ON rev.constant = ar_rev.constant

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