Question

我有一个查询，它计算给定周的给定字段的不同值的数量。它计算了本周新值的数量。

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执行相同的计算。

我该怎么做？

Answer 1

好吧，如果我理解正确的话，第一次就会在某个星期内出现一个字段。您希望每周计算存在多少次此类事件。因此，首先获得每个字段的第一个日期。然后每周计算。

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);

将mysql查询在一个句点上扩展到多个句点

1 个答案: