SQL組按月的日期

Question

我有一個查詢，返回到期日期：

    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年份的任何時間。

我需要返回12個月內每個月內將要到期的單位數的計數。

我不知道該怎么做？

Answer 1

您可以執行以下操作：

例如，2012年到期的單位數：

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)

Answer 2

我需要返回在12個月內每個月內將要到期的單位數的計數。

如果您是說從當前月份開始，

SELECT
    [YYYY.MM]    = CONVERT(varchar(7), cvu.ExpirationDate, 102),
    CountInMonth = COUNT(*)
FROM dbo.clientinfo ci
JOIN clientvehicleunit cvu ON ci.clientid = cvu.clientid
WHERE cvu.ExpirationDate >= DATEADD(m, DATEDIFF(m,0,getdate()), 0)
  AND cvu.ExpirationDate <  DATEADD(m, DATEDIFF(m,0,getdate())+12, 0)
GROUP BY CONVERT(varchar(7), cvu.ExpirationDate, 102)
ORDER BY [YYYY.MM]

注意：期間以[YYYY.MM]格式打印，例如2011.01