T-SQL 按年和月排序

Question

我想根据日期 yyyy,mm 按日期排序。 我首先尝试使用 VARCHARS：

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

但是将它们转换为 varchar 意味着我的排序就像 2014.1 - 2014.11 - 2014.12 - 2014.2 我怎样才能按年和月的顺序正确排序？

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

您只是不需要将它们转换为 varchar，YEAR 和 MONTH 返回整数：

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