将mysql查询从一个周期扩展到多个周期

我有一个查询，它统计给定字段在给定的一周内的不同值的数量，而以前没有。它统计本周新值的数量

SELECT 
    COUNT(DISTINCT (field))
FROM
    table
WHERE
    (creation BETWEEN CURDATE() - INTERVAL DAYOFWEEK(CURDATE()) + 5 DAY AND CURDATE() - INTERVAL DAYOFWEEK(CURDATE()) - 2 DAY)
        AND field NOT IN (SELECT DISTINCT
            (field)
        FROM
            table
        WHERE
            creation < CURDATE() - INTERVAL DAYOFWEEK(CURDATE()) + 5 DAY);

我需要扩展查询，以便能够在过去两个月的所有周内进行相同的计算

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我该怎么做呢？

好吧，如果我理解正确，一个字段在某个星期内第一次出现。您希望每周统计此类首次出现的次数。因此，首先获取每个字段的第一个日期。然后每周数一次

select 
  yearweek(first_occurence),
  count(*)
from
(
  select field, min(creation) as first_occurence
  from table
  group by field
) fields
group by yearweek(first_occurence)
order by yearweek(first_occurence);