SQL 按月分组日期

Question

我有一个返回到期日期的查询:

    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。

我需要返回 12 个月内每月有多少单位到期的计数......

我不知道该怎么做？

Answer 1

你可以这样做:

例如有多少单位将于 2012 年到期:

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)