T-SQL按年份和月份排序

Question

我想按照日期yyyy，mm按日期排序。 我首先嘗試使用VARCHARS：

GROUP BY (YEAR(join_date) AS VARCHAR(4)) + '-' + CAST(MONTH(join_date) AS VARCHAR(2))

但是將它們轉換為varchar意味着我的排序就像2014.1-2014.11-2014.12-2014.2如何按年份和月份順序對它們進行正確排序？

SELECT Year(join_date) + MONTH(join_date) AS Date, COUNT(*) AS Count
FROM X
WHERE mtype ='A' AND (join_date BETWEEN DATEADD(year, -5, GETDATE()) AND GETDATE())
GROUP BY YEAR(join_date) + MONTH(join_date)
ORDER BY Date ASC

Answer 1

您只需要將它們轉換為varchar， YEAR和MONTH返回整數：

SELECT Year(join_date) As JoinedYear, MONTH(join_date) AS JoinedMonth, COUNT(*) AS Count
FROM X
WHERE mtype ='A' AND (join_date BETWEEN DATEADD(year, -5, GETDATE()) AND GETDATE())
GROUP BY YEAR(join_date), MONTH(join_date)
ORDER BY YEAR(join_date) ASC, MONTH(join_date) ASC