first rev - Quarry

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

SQL

WITH 
    least_rev_ts AS (
        SELECT
            MIN(rev_timestamp) AS dt,
            'constant' AS constant
        FROM
            revision
    ),
    least_ar_rev_ts AS (
        SELECT
            MIN(ar_timestamp) AS dt,
            'constant' AS constant
        FROM
            archive
    )

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

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