SQL 按月分组日期 [英] SQL group dates by month

问题描述

我有一个返回到期日期的查询:

I have a query that returns expiration dates:

    SELECT ci.accountnumber
           , ci.accountname
           , cvu.ExpirationDate
      FROM dbo.clientinfo ci
INNER JOIN clientvehicleunit cvu ON ci.clientid = cvu.clientid

到期日期可以是任何月份和任何年份的任何时间.

The expiration dates can be anytime during any month and any year.

我需要返回 12 个月内每个月内到期的商品数量....

I need to return counts of how many units are due to expire within each month for a 12 month period....

我不知道该怎么做?

推荐答案

你可以这样做:

例如有多少单位将于 2012 年到期:

e.g. how many units are due to expire in 2012:

SELECT MONTH(cvu.ExpirationDate) AS Mnth, YEAR(cvu.ExpirationDate) AS Yr, 
    COUNT(*) AS DueToExpire
FROM clientvehicleunit cvu
WHERE cvu.ExpirationDate >= '20120101' AND cvu.ExpirationDate < '20130101'
GROUP BY MONTH(cvu.ExpirationDate), YEAR(cvu.ExpirationDate)

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